->'''Nancy:''' What I learned in the dream clinic. That's what I'm trying to prove, Mother. Rod didn't kill Tina and he didn't hang himself. There's this guy. He's after us in our dreams.\\
'''Marge:''' But that's just not reality, Nancy.
-->-- ''Film/ANightmareOnElmStreet1984''

Sometimes, in fiction, the dreamer isn't the only one seeing his or her dream. Sometimes another character sees the dream or can enter it and become part of it. Sometimes it's played straight, other times for laughs, with a statement like, "Hey, this is my dream!" or "Hey, it's your dream."

Sometimes characters do this for malevolent reasons, seeking to terrify and/or harm the dreamer for their own purposes (like [[Franchise/ANightmareOnElmStreet Freddy Krueger]]); others devote their abilities to protect dreamers from such threats (like Comicbook/DoctorStrange). If a shared DreamLand exists that dreaming minds are drawn to, Dream Walkers will typically be the ones to be consciously able to head to this dreamland, seek out places within it, or move between different dreaming worlds. A Dream Walker may also be capable of taking other people along when moving between dreams, even if these can't do so on their own. If the Walker hares off while their tagalongs are still in someone else's dreamscape, then they'll likely remain stuck there until everyone involved wakes up.

Compare/contrast DreamWeaver and DreamStealer, which can overlap. Also compare/contrast with SharedDream, where characters all have a shared, collective dream. Not to be confused with DreamSpying. See also TalkingInYourDreams. If a Dream Walker is able to take objects back into the waking world, see also TakenFromADream.

Not to be confused with the [[Webcomic/{{Dreamwalker}} webcomic of the same name]].
----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Anime/EighteenIf'': Protagonist Haruto Tsukishiro, by virtue of being trapped in a DreamLand, can enter the dreams of others.
* ''Manga/AyakashiTriangle'':
** Ayakashi are [[OurSpiritsAreDifferent spirits]] that can enter humans' dreams by possessing them. When an ikon possessing Lu drains her life until she loses consciousness, it tries to attack her in her dreams to take the rest. Suzu can effectively enter dreams as well via [[SelfDuplication creating an omokage]] RemoteBody, but this also seems to connect things to ''her'' dreams, and thus her subconscious.
** Matsuri is a more complicated variant. When he exorcises an ayakashi from someone, he sends a fragment of his spiritual power into them, and if they're dreaming it appears to them as Matsuri's ResidualSelfImage. However, while this fragment acts as Matsuri would (though it seems incapable of speech), the actual Matsuri has no awareness of what is sees and originally didn't even know it ''existed''.
* This is Yuko's primary demonic power in ''Manga/TheDemonGirlNextDoor'', overlapping with DreamWeaver. Yuko can enter the dreams of basically anything capable of dreaming, as long as she and her target are both asleep, and while there, she can [[ImaginationBasedSuperpower manifest into being]] virtually anything she can imagine. Thing is, she doesn't have a very good imagination. She initially thinks that [[WhatKindOfLamePowerIsHeartAnyway it's a pretty lame power]] to have, until her initial uses of it show that her dream manipulation is just a {{Required Secondary Power|s}} for what she's really capable of: manipulating the subconscious mind of the dreamer, as dreams are the window into the subconscious. When she finds she can do things like [[BedtimeBrainwashing plant unconscious suggestions]], create phobias or cravings, or even [[EmotionControl overwrite emotions]] to make [[GettingSmiliesPaintedOnYourSoul bitter enemies into grudging friends]], she realizes [[HeartIsAnAwesomePower her abilities are a lot more dangerous than she thought]] and is [[MyGodWhatHaveIDone disgusted with herself]], even though her friends remind her that all she had ever used her powers for is [[YouAreBetterThanYouThinkYouAre to bring happiness to the people around her.]]
* ''Anime/DoraemonNobitasThreeVisionarySwordsmen'' have Nobita and Doraemon having adventures in the dream world of Yumemiru, and feeling lonely, Nobita actually convinced Doraemon to use the machine to drag his friends Shizuka, Suneo and Gian ''into'' his dream. Much to the annoyance of the latter two, since Gian is dreaming about holding a global concert while Suneo's about to dream of going to a vacation in Mars.
* ''Anime/UtaKata'' starts off its main plot with the protagonist seeing a girl come out of a mirror and settle into her life; but she realises the same girl appeared in her dreams, and recalling how those dreams went becomes an important piece of foreshadowing.
* In ''Manga/{{X 1999}}'', Hinoto's sister Kanoe is more of this than a DreamWeaver (save for the TV series). Also [[spoiler: Hokuto Sumeragi]] straddles the line: she can enter other people's dreams, alright, but has very few ''actual'' influence on them ''and'' can only do it when she herself is asleep, while the others can do it when awake too.
* ''Manga/WhyTheHellAreYouHereTeacher'' has a chapter where MadScientist Nanjou-sensei invents a machine to do this to Tadashi. Of course being the [[{{Ecchi}} genre]] that it is, it's an EroticDream.
[[/folder]]

[[folder:Comic Books]]
* ''ComicBook/AndersonPsiDivision'': Both the Sisters of Death and Judge Death have invaded Judge Anderson's dreams on separate occasions.
* ''ComicBook/{{Bone}}'': Those with a powerful dreaming eye have the ability to influence or invade the dreams of others. Dragons are naturally powerful dreamers and seem to have this ability as a rule, which comes in handy when the Great Red Dragon is forbidden from directly interfering with the war, as he can still guide Thorn and Fone Bone through their dreams.
* Comicbook/DoctorStrange has occasionally entered the dreams of clients to help them. His enemy, Nightmare, can control dreams and gain power through them.
* In ''ComicBook/LucyDreaming'', Lucy and her friend Welsey enter the same dream more than once. Not only that, in the first issue, Lucy encounters someone else who is having the same dream, who she later suspects is Welsey's missing father.
* As originally established in [[WesternAnimation/MyLittlePonyFriendshipIsMagic the show]], Princess Luna from the ''ComicBook/MyLittlePonyFriendshipIsMagicIDW'' has this ability. She's even described as the "Protector of Dreams".
* ''ComicBook/TheNewUniverse'' character ComicBook/{{Nightmask}} has this as his superpower.
* In ComicBook/PoetAndersonTheDreamWalker, the Dream World and its hub city of Genesis is explained as the result of the collective dreaming subconscious of humanity. Lucid dreamers are able to experience the collective dreams of everyone else given form as a specific place.
* ''ComicBook/RisingStars'': One person has this power.
* ''ComicBook/TheSandman1989'':
** In "Sandman: The Doll's House", Rose [[PunnyName Walker]] can do this during her brief time as a dream vortex.
** Dream himself can also do this, of course (being the Anthropomorphic Personification of dreaming) and regularly uses this ability throughout the series. Special note must be made of the time he hijacked a car that was being used as the set for an EroticDream and drove to London in it.
* Ramona Flowers from ''ComicBook/ScottPilgrim''.
* A little-seen mutant in the ''Comicbook/XMen'' comics named Rem-Ram has this as his power, as a sort of telepathy which works only on the sleeping. He can contact the mind of a person who is awake, but that causes him severe pain and possible neurological injury.
** A more powerful but just as discreet mutant is Fontanelle, the daughter of the villainess known as Black Womb, whose power consists indeed of walking into people's dreams and finding whichever she needs for intelligence.
[[/folder]]

[[folder:Fan Works]]
* ''Fanfic/CaveDancersPrettyCure'': In Episode 4, [[Anime/YesPrettyCure5 Cure Dream]] enters a shared dream between [[Series/FraggleRock Gobo and Red Fraggle]] to encourage them not to give up on their search for the Dance Crystals. She mentions she came because Cure Mint, who had the prophecy about the Cave Dancer Cures in the first place, can't walk in dreams.
* ''Fanfic/DavionAndDavionDeceased'': Hanse Davion(circa 3052) has a dream with his ancestor John Davion(circa 2760). But for Hanse, it's a DyingDream, and John wakes up in the morning with Hanse's ghost haunting him.
%%* ''Fanfic/DiariesOfAMadman'': Navarone learns how to do this from Luna, and becomes quite talented at it.%%Learns how to do what?
* ''Fanfic/ADiplomaticVisit'': As in canon, this is one of Luna's Duties, per her Role as the [[PowersThatBe Lady of Dreams]], helping ponies who are having bad dreams so she can help them work past whatever problem they're having. Her Opposite, the Lord or Lady of Nightmares, also has this ability. [[spoiler: In the epilogue of the third story, Luna and Pharynx begin training Moondancer to dreamwalk as well, via Luna sharing her Mantle to make Moondancer the first of her Dreamguards, and the two (and Pharynx) soon discover that Luna and Pharynx's foal is likely to have this power naturally as well, via tapping their Mantles.]]
* ''Fanfic/HalfPastAdventure'': [[{{Deuteragonist}} Robin]] has this as part of zhir ComboPlatterPowers, much like zhir great-grandfather [[WesternAnimation/AdventureTime Jake]].
* ''Fanfic/HeroChat'': The Goat Miraculous [[AdaptationalSuperpowerChange grants the power to enter one's dream]]. In their debut chapter as the Goat Hero Capricorn, Marc uses it to enter Marinette's dream and help wake her up when she and most of Paris are trapped in their sleep by an akuma.
* ''Fanfic/HushNowLittleOne'' (''WesternAnimation/TurningRed''/''WesternAnimation/{{Encanto}}'' crossover): Bruno visits Tae-young's mind during a nightmare.
* ''Fanfic/KarmaCircleJudgement'': Daan Yel has the power to reach into people's minds and dreams. He does so to numerous people that Gaz has hurt in real life, including her brother Dib, and shows her how they really feel about her by letting them [[NoHoldsBarredBeatdown take out their anger on her in a dream]].
* ''Fanfic/TheManyWorldsInterpretation'': Dream-walking is a part of Literature/{{Discworld}} magic, as both Wizards and Witches know. Unseen University even teaches how to do it to suitably inclined student Wizards and describes it as Walking The Astral Planes. Witches tend to pick it up informally and call it Stepping Out. Ponder Stibbons has to do it to rescue Sheldon Cooper from a trap set by a lurking multi-dimensional peril. In a later tale, he has to rescue a daughter from the Dungeon Dimensions. [[note]]He discovers his Witch daughter is perfectly capable of extracting herself.[[/note]] Later, his Witch-daughter meets [[SpiritAdvisor a deceased Ancestor]] in a dream, who takes advantage of being outside time to show her some History. Bekki uses this knowledge to annoy her History teacher.
* ''Fanfic/{{Moonlight|JasonTheHuman}}'': Luna enlists Scootaloo's help for this to combat the nightmares induced by their mysterious opponent. Sweetie Belle and Apple Bloom later join her to help.
* ''Fanfic/TheNewAdventuresOfInvaderZim'': Dib spends most of Episode 9 doing this, using a spell he's found to explore the dreams of all the other main characters. Interestingly, the trope is {{Deconstructed|Trope}}, as everyone tells Dib that wandering into other people's minds without their consent is immoral. [[spoiler: [[ChekhovsGun Comes into play again]] in Episode 21, when he uses it to free his friends from the LotusEaterMachine that Norlock put them in.]]
* ''Fanfic/PastSins'': ''Glimpses 2'': "Dreams": Twilight travels into Nyx's dreams.
* ''Fanfic/PokemonResetBloodlines'' features a few examples:
** Agatha's Gengar often wakes her up this way, using a milder version of Dream Eater, which also enables to talk to each other.
** [[EldritchAbomination MissingNo]], when not causing Ash to have weird dreams, often walks into his normal dreams to torment him.
** [[spoiler: Anabel]] discovers she can do this when she tries to force herself to sleep in Chapter 41. She ends up entering the dreams of Ash, Delia, and Iris.
* ''Fanfic/AShadowOfTheTitans'': One chapter features Jade, as an extra credit assignment, using a spell to visit the dreams of her teammates. Then, she tries to see what happens if she enters her own sleeping body, and ends up in her subconscious, where she finds [[spoiler:Tarakudo screwing with her head]], though she passes this off as a dream.
* ''Fanfic/SteelSoulSaga'': ''Steel Spirit'': In the first chapter, [[https://www.fimfiction.net/story/82359/1/steel-spirit/sparks-of-faith "Sparks of Faith"]], when Sweetie Belle thinks about Luna's powers to do this to stop nightmares, but she's not exactly a pony:
-->''She wondered why Luna never visited her in those nightmares... or even if she could.''
* ''Fanfic/TantabusMarkII'': Combined with DreamWeaver; as in canon, Luna travels the dreams of her subjects to help them with their nightmares. The fic starts because Luna decided she needed some backup and repurposed her old Tantabus project to help. Then [[CreatingLifeIsUnforeseen it started calling her Mom]], and after an initial FreakOut she was happy to have a child with her own powers and purpose. The Tantabus ends up teaching a couple other ponies how to use dream magic.
-->'''Tantabus:''' You are currently the third most skilled dream mage in Equestria. Granted, [[OverlyNarrowSuperlative there are only three dream mages in Equestria]], but still.
* ''Fanfic/UsAndThem'': To get back at the author of the erotic novel based on her and Sephiroth' [[AlternateUniverse relationship]], Aeris enters her dreams and basically gives her a ReasonYouSuckSpeech.
[[/folder]]

[[folder:Films -- Animated]]
* ''WesternAnimation/{{Dreambuilders}}'': Minna, upon discovering the dream world, uses it to interact with other people's dreams, particularly Jenny's.
[[/folder]]

[[folder:Films -- Live-Action]]
%%* ''Film/{{Dreamscape}}''.
* ''Film/TheHauntingOfSilverFalls'': The hauntings start with Holly invading Jordan's dreams in an effort to get the ring back.
* ''Film/{{Inception}}'': This is something technically any one can do if they have access to the technology. However, the film is set TwentyMinutesIntoTheFuture, so the technology is limited to mostly military and those lucky few who can get their hands on it.
* ''Film/TheKnightBeforeChristmas'': The mysterious [[QuestGiver quest giving]] "[[SolitarySorceress Old Crone]]" who send Sir Cole [[TimeTravel from 1334 to 2019]] is also able to reach into his dreams to remind him that he needs to complete his quest, though she still only [[CrypticConversation drops hints in riddles]].
* ''Film/TheLastWitchHunter'': Chloe is one of rare witches gifted with this skill. It's considered a [[BlackMagic Dark]] gift and Kaulder tells her that the dreamwalkers used to be the Witch Queen's deadliest assassins (YourMindMakesItReal is in effect), but Chloe uses it for the light side.
%%* ''Film/TheMatrix'' is a variant on this.
* ''Franchise/ANightmareOnElmStreet'' centers on this type of thing. The villain Freddy Krueger, an undead serial killer, can enter anyone's dreams at will and manipulate them as much as he wants, using his powers to torment and slaughter his victims in increasingly creative ways. Any damage he does in a dream crosses over into the real world, making for some truly horrendous scenes.
[[/folder]]

[[folder:Literature]]
* ''Literature/OneHundredCupboards'': One of the powers of Green Men; Henry is particularly good at it. At one point Henry and Monmouth dreamwalk to [[MundaneUtility have a conversation]] despite being in the same room, because Monmouth's [[TapOnTheHead head injury]] won't hurt in a dream...until Henry notices it isn't there and can't imagine it away again.
* ''Literature/AstralDawn'': Caspian is quite the dream walker early on. Caspian literally walks through his dream on a bridge made of glass within a cloud where he soon meets Ixchel, the Mayan goddess of the moon. Caspian later follows her beyond the mortal plane into the astral plane, taking his {{dream sequence}} to an unprecedented level.
* ''Literature/TheChroniclesOfDorsa'': Joslyn's Ku-sai (sword master) was able to create a dream chamber and keep a part of his soul there then communicate with her in it, drawing Joslyn inside his dream then speak with her there together. She was to be taught this as well, but ran off and joined the Imperial Army instead before her training had completed. Later she starts learning on her own to create dream chambers and enter others' dreams, while shaping hers.
* ''Literature/ChroniclesOfTheKencyrath'': This is common:
** This gives an interesting twist to {{Erotic Dream}}s. If both people are in the dream as themselves, in control of their own actions, would dream sex be considered real? Timmon tries many times to have an EroticDream with Jame Once he's [[{{Twincest}} kicked out of the dream, in favor of another lover]].
** DreamingOfTimesGoneBy dreams are pretty common, and the dreamers are placed in the bodies of the people in the historical scenes. Seeing as these scenes are often tragic, this can be pretty upsetting for the dreamers.
* ''Literature/CthulhuArmageddon'' :The ghoul Richard Jameson possesses this as one of his abilities. John eventually develops the power himself. The Dreamlands are one of the rare places humans have an advantage over the Great Old Ones and similar beings as whoever has the strongest imagination triumphs.
* ''Literature/TheDresdenFiles'': "The Nightmare" from ''Literature/GravePeril'', the third book in the series, is a malevolent example. He's a ghost who enters people's dreams for the purposes of MindRape and murder.
* ''Literature/DragonCalling'', N. R. Eccles-Smith's HighFantasy series:
** The mysterious boy, known only as Opal Eyes, enters [[TheHero Laeka'Draeon's]] mind in dreams as a way to communicate with him.
** The sphinx, Riine’tae, is an ''actual'' dream-walker (in the series); her abilities being inherent (and very rare). She enters Laeka’Draeon’s dreams to sniff out his motives, but instead accidentally witnesses a Beacon Throne premonition.
* ''Literature/DreamRovers'': The dreamrovers can visit and manipulate others' dreams. It becomes unpopular to say the least when other people realize how the power could be abused
* ''Series/{{Firefly}}'': In the novel “Ghost Machine”, River steps into the characters’ dreams attempting to wake them before their ship crashes.
* ''Literature/JessicaChrist'': Jessica gets visits from her half-brother Jesus ([[UsefulNotes/{{Jesus}} yes, that one]]) in her dreams... specifically, in her [[EroticDream sex dreams]], since she drops her mental defenses when having those and that's the only way he can get in touch with her to deliver instructions for her divine destiny. Neither of them is especially pleased with the arrangement, needless to say. [[spoiler:She later learns that she can pull an angel into her dream at will, which becomes useful for getting around [[{{God}} her father's]] ban on premarital relations between Jessica and her angelic boyfriend...]]
* Creator/HPLovecraft: The {{Dreamland}}s can be accessed by those who know how to descend the Steps of Deeper Slumber and pass the Cavern of Flame, thereafter becoming a Dreamer who can traverse the Dreamlands, and encounter both the native people and beings of this world and other Earth-natives going through their own second sleeping lives. Powerful Dreamers can bring entire landscapes into being. It is mentioned on occasion that a well-developed Dreamer can survive in the Dreamlands even after their physical body dies, although they will lose the ability to return to the waking world.
* ''Literature/MalazanBookOfTheFallen'':
** K'rul appears in Kruppe's dreams because he can't fully manifest in the real world at the beginning of the series. He uses him as a connection to everyday mortal life in the waking world, informs him of happenings far away and even steers him to influence the power players in the city of Darujhistan. He also uses his dreams to organize the complicated rebirth/soulmeld of Silverfox, which involves not only dream walking, but TimeTravel as well.
** Played with in the dreams of Udinaas. He does not himself walk in other people's dreams, but others, especially gods and those seeking power, are drawn to ''his'' dreams like moths to a flame, sharing information with him, trying to seduce him to join their side or trying to spy on him. Udinaas eventually learns to banish anyone he doesn't want inside his dreams but just the fact that he has to guard against them means many a sleepless night for him.
* ''Literature/MurderForTheModernGirl'': Ruby is able to enter the dreams of other people through her mind-reading ability. There, she can explore the dream world with the dreamer. She mainly enters the dreams of her sisters when she can't sleep.
%% * ''Literature/{{Paprika}}'', and the anime film based on it.
* ''Literature/{{Portent}}'', by Creator/JamesHerbert: Numerous psychically buoyant children project their minds to a vast, lush garden, watched over by the similarly psychic "Dream Man."
* ''Literature/RachelGriffin'': Zoe can enter people's dreams as well as travel to their physical location, a useful talent if someone is [[DemonicPossession possessed]]: she can FlashStep up behind them and belt them with a war club.
%%* ''Literature/RaisingAngels'': Lizbeth seems to be capable of this.
%%* ''Literature/TheRavenCycle'': Played with, and the premise for the second book in the series, ''The Dream Thieves''.
* ''Literature/{{Ravenor}}'': Gideon Ravenor's psychic powers let him enter people's dreams, and he can take a dreaming person with him into another person's dream. He visits most of his companions this way near the start of the second book in order to ask them an important question.
* ''Literature/AShadowBrightAndBurning'': Magicians have the ability to enter the dreams of others. [[spoiler:Jenkins Hargrove visits Henrietta this way after she fends off [[EldritchAbomination Korozoth]]'s attack on UsefulNotes/{{London}}.]] [[spoiler:R'hlem, one of the Ancients, has this ability as well, as he visits one of Henrietta's dreams this way too.]]
* ''Literature/SonjaBlue'': This is one of the powers of vampires. When Sonja is in an insane asylum, and her human side is being suppressed by anti-psychotic drugs and sedatives, her vampire side goes dream-walking at night, making the other inmates even more insane than they were to start with.
* ''Literature/SwordOfTruth'': Dream Walkers were gifted people altered by magic so they had an ability to enter others' dreams and so take control of their minds. Over time they grew in strength so that their ability extended to waking life also, but the name was retained.
* ''Literature/VampireAcademy'': Adrian Ivashkov can visit the dreams of other people.
* ''Literature/VoyageToTheBunnyPlanet'', by Creator/RosemaryWells: Janet the Bunny Queen can visit to any sleeping bunny's dreams. Mainly to comfort them after having a bad or rough day. She would usually bring them to her home planet and show them a dream where the bunny she brings is having a very happy and peaceful day time.
* ''Literature/WarriorCats'': Jayfeather can enter other cats' dreams, as can the members of [=StarClan=] and the Place of No Stars. This ability is revealed to have been revoked in ''Bramblestar's Storm'' after the spiritual battle between [=StarClan=] and the Dark Forest had been concluded.
* ''Literature/TheWheelOfTime'': Dreamwalkers can, among many other things, visit the dreams of others if they are so inclined. However, they are generally careful not to as once inside the dream they are subject to the dreamer's will and may be unable to escape. Also, if a Dreamwalker feels intense love or hatred for a given individual, they may be drawn into that person's dreams. Dreamwalkers spend most of their time in the DreamLand.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/BehindHerEyes'': [[spoiler: In the past, Rob and Adele learn to enter each other's dreams. In the present, Adele teaches these techniques to Louise.]]
* ''Series/Charmed1998'': One of the only non-magical threats the sisters faced was the Dream Sorcerer, a human scientist who found a way to enter and control women's dreams. He used it to terrorize and murder (a la [[Franchise/ANightmareOnElmStreet Freddie Kruger]]) women who rejected him.
* ''Series/TheReallyLoudHouse'': After most of the sisters eat a cursed cheesecake that traps them in their nightmares, Lucy gives Lincoln and Clyde the means to enter their dreams to rescue them. This involves giving them a necklace that they must keep on at all times, or else the nightmares will follow them back to the real world.
* ''Series/{{Roswell}}'': Isabel has this ability, and she seems to need a photo of the person to touch to be able to do this. Whether this is actually needed, or just because Isabel hasn't had proper training in the techniques is not clear. In [[Literature/RoswellHigh the books that inspired the series]], all the aliens can do this, and they can also bring humans into other people's dreams by holding their hand while they enter the dream.
* In an episode of ''Series/SabrinaTheTeenageWitch'', Sabrina gets a part time-job as a Sandman, which involves her using magic sand to help mortals sleep. She soon discovers that while she wears her sandman uniform (robe pajamas with a sleeping cap) she can enter the dreams of others. She soon learns the dangers of eavesdropping on other people's dreams.
-->'''Zelda:''' I can't believe you were dreamdropping.\\
'''Sabrina:''' I can't believe there's a word for it.
* ''Series/{{The Sandman|2022}}'':
** Morpheus, as the lord of the dream realm, can enter and affect the dreams of any sleeping person.
** Rose Walker gains a similar ability when her status as a Dream Vortex manifests, although (at least at first) it's limited to the dreams of people in close physical proximity.
* In the ''Series/StargateSG1'' episode "[[Recap/StargateSG1S6E19TheChangeling The Changeling]]", Teal'c experiences near-death hallucinations after he and his mentor Bra'tac are the sole survivors of an ambush, alternating between a seemingly normal day at Stargate Command and a life where he is a firefighter preparing to give his stepfather a kidney transplant. The firefighter hallucination features Daniel Jackson (who is currently an Ascended being) acting as a hospital psychiatrist, who helps Teal'c realise what is happening to him. It is ultimately revealed that Daniel was truly appearing in Teal'c's dream at this point, bending the Ascended's rules against interference to offer his friend emotional support until the rest of the team could rescue him.
* ''Series/{{Supernatural}}'':
** Angels can enter dreams to speak with the dreamer and deliver messages if they need to. This is sometimes the only way angels can communicate with Sam and Dean, who are often warded against (via hex bags) or physically marked against (via writing etched onto their ribs by Castiel) angels finding them personally. Castiel regularly visits Dean in his dreams, enough to that Dean has gotten used to it, but he's unnerved when Castiel says that it's not a secure space and they need to find a more private place to talk.
** PlayedForLaughs when FallenAngel Anna walks in on an EroticDream Dean is having (involving two strippers in angel and devil costumes) much to his embarrassment.
** Azazel, the yellow-eyed demon, is also shown to be able to communicate with people this way, though he can sometimes also influence the dream.
* ''Series/TheTwilightZone1985'': In "Dream Me a Life", Roger Simpson Leeds is unwillingly drawn into Laurel Kincaid's dream by her late husband so that he can help her to come to terms with her [[ExcessiveMourning overwhelming grief]] which caused her to enter a [[EmptyShell catatonic state]].
[[/folder]]

[[folder:Music]]
* In Music/DavidByrne's song "The Dream Police", there's an entire justice system to prosecute crimes committed in sleep.
-->Everyone has the same dreams, on different days of the week.\\
We are the watchdogs of your mind, we are the dream police.
[[/folder]]

[[folder:Myths & Religion]]
* A recurring notion in mysticism is that two people can and will share a dream if they are sufficiently connected, ideally emotionally so, in real life. The kicker is that the active dream world, the "Astral Plane" of the mystics, stands outside time and space. Just because Bob dreamt that Alice entered his dream and they interacted in a "real life" sort of way does not mean that they both had the same shared dream on ''the same night''. Alice might remember having that dream ten years ago -- or she may not have it for another twenty years. ''Literature/{{Illuminatus}}'' creators Bob Shea and Creator/RobertAntonWilson described dreamspace as the ''[[BilingualBonus MorgensHeuteGesternewelt]]'' -- the "tomorrow-today-yesterday world".
[[/folder]]

[[folder:Podcasts]]
* This is Rose's ability in ''Podcast/TheBrightSessions''.
* The horrifying power of the main character in ''Podcast/TheMagnusArchives''. At first it seems like his bad dreams are a reaction to trauma, but it is eventually revealed that they don't belong to him at all. When the Archivist takes a statement from a victim, he causes them to have constant nightmares of their own trauma, which he then enters in order to watch them suffer. Over and over and over. And here we thought that the Archivist's patron, the Ceaseless Watcher, was the fluffiest EldritchAbomination in town.
[[/folder]]

[[folder:Roleplay]]
* In ''Roleplay/DawnOfANewAgeOldportBlues'', Zia can view other people's dream as a result of her {{telepath}}ic powers. The downside being that it prevents her from getting a good night's sleep.
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/ChuubosMarvelousWishGrantingEngine'': Sosunov magic is focused around dreams, including the option of walking into one to communicate with people or defend them from Outside-spawned dream horrors. The Dream-Witch character is also capable of this, despite not being a Sosunov or, for that matter, human (technically speaking).
* ''TabletopGame/DungeonsAndDragons'': The 3.5th edition supplement book ''Heroes of Horror'' supplies ideas and optional rules to create dream (or nightmare)-like sessions. This includes purposeful or accidental entry of a dreamworld from the waking world. It's only natural that it also features certain feats based on interpreting and entering the dreams of others, called [[WhateverMancy Oneiromancery]].
* ''TabletopGame/InNomine'': Angels of Blandine (Archangel of Dreams) and demons of Beleth (Demon Princess of Nightmares) do this as a matter of course. It's also possible for others to learn to do it.
* ''TabletopGame/{{Pathfinder}}'': Dream and nightmare dragons, night hags and alebrijes can pass through the Material Plane, the Ethereal Plane and the Dimension of Dreams at will, entering and exiting dreaming minds as they please.
* ''TabletopGame/PrometheanTheCreated'': One First Edition supplement introduced the rare "Dreamborn" Prometheans; rather than being made in the traditional way (i.e. digging up corpses and bringing them BackFromTheDead) these Prometheans were instead created from people's ''dreams'' of doing that, sometimes intentionally, sometimes by accident. They consequently have a Bestowment that allows them to enter the dreams of people nearby (whether they want to or not) and their Wasteland effect causes a plague of nightmares, with the Dreamborn Promethean as the boogeyman they all share. Unusually however, the Promethean can't ''interact'' with the dream or dreamer at all, and is instead a powerless observer; Prometheans being [[BlessedWithSuck what they are]], they're denied ''any'' connection with humanity, even on that basic level.
[[/folder]]

[[folder:Video Games]]
* Kaname Date, the protagonist of ''VideoGame/AITheSomniumFiles'', is a detective who can use a special machine to "psync" with people, allowing him to see their dreams in order to extract clues from their subconscious. But given how dreams are, the information he gains this way can be somewhat unreliable.
* The title character of ''VideoGame/{{Alundra}}'', as well as Meia, has this as their main power and use it to free people from the nightmares created by various dream demons.
* In ''VideoGame/AnimalCrossingNewLeaf Animal Crossing: New Leaf'' and ''VideoGame/AnimalCrossingNewHorizons'', this is implied to be an ability of your character as you can share your town/island and enter the towns and islands of others via the Dream Suite. And these shared locales are explicitly stated to be dreams.
* [[PlayerCharacter The Hunter]] of ''VideoGame/{{Bloodborne}}'' is one, he travels across the land of [[DreamLand Yharnam]] to seek a solution to halt the source of [[NightmareSequence nightmare]] brought by the [[EldritchAbomination Great Ones]].
* ''VisualNovel/DaCapo'': Protagonist Jun'ichi has the ability to view other people's dreams when he sleeps. He doesn't like it much, saying that in practice, most people's dreams [[RealDreamsAreWeirder don't make any kind of sense]], are often very boring, and the whole thing just leaves him not getting as much rest as he'd like. [[PowerIncontinence Also, it happens whether he wants it to or not.]]
* ''Franchise/DragonAge'':
** [[DreamLand The Fade]] is where all races (barring the Dwarves) go when they sleep, though only Mages are capable of remaining self-aware whilst in the dreamworld. Because of this unique ability, they developed certain magical rituals involving lyrium, allowing them to enter the Fade whilst awake, enter another person's dreams, or allow them to release people from demonic possession, by attacking the demon at the source. Mages who attain full DreamWeaver status are known as "somniari" to the elves, though those are incredibly rare.
** ''VideoGame/DragonAgeInquisition'' has Solas, an expert on the Fade who regularly visits it just to hang out with spirits. He doesn't appear to be a Somniari, but at one point has a lengthy conversation with the Inquisitor while they're both dreaming. [[spoiler: Given his real identity, he might as well as one of the somniaris, the oldest and original ones in fact.]]
** ''Physically'' entering the Fade, as opposed to lucid dreaming, is nigh-impossible without extremely potent magic such as the Eluvians or the Anchor.
* Alice Drake, the heroine of ''VideoGame/{{Dreamkiller}}'' has the ability to enter and exit dreams at will, and she uses her powers to infiltrate her clients' nightmares to purge them of their phobias by destroying the monsters inside their dreams.
* ''VideoGame/TheDreamMachine'' includes the main character, Victor, and [[spoiler: his landlord, Mr. Morton, and the machine itself.]]
* While trapped in Storytime in ''VideoGame/DreamfallChapters'', Zoë learns to enter other people's dreams and to manipulate them—and extension of her Dreamer powers that she demonstrated in the original ''[[VideoGame/DreamfallTheLongestJourney Dreamfall]]''.
* ''VideoGame/{{Elona}}'' has a wizard that can randomly show up in your character's dreams by accident. To make up for bothering you, he teaches you a random spell, including some potentially rare ones.
* In ''VideoGame/FarnhamFables'', the dreamgivers Ethrea and Althea are spirits who can travel into people's dreams. Althea the Nightmare mostly uses these abilities to PokeThePoodle, like in Episode 4 where her "evil plan" basically consists of making Theresa do a FetchQuest. The ending of that episode also reveals that Ethrea can link people's dreams together, [[spoiler:which she does to [[AuthorAvatar Andrew]] in order to put an end to Althea's mischief.]]
* ''VideoGame/FinalFantasyVII'' has a segment where Tifa dreamwalks inside Cloud's dream.
* The playable character in ''VideoGame/HollowKnight'' gains the ability to enter dreams with a Dream Nail. For the most part this is merely used to invade the dreams of slain bosses so that you can fight stronger versions of them, but it is also a very plot important key ability used to [[spoiler: enter the White Palace of the Pale King, which was transported into the realm of dreams and sealed within the void of a Kingsmould, as well as the dream of the titular Hollow Knight wherein you can confront the TrueFinalBoss]].
* In ''VideoGame/KingdomHearts3DDreamDropDistance'', Sora and Riku are tasked with diving into the dreams of sleeping ''worlds'' to reawaken them. A late-game development also reveals that [[spoiler:the Drop mechanic and the Dream Eater emblem on Riku's new outfit were because Riku had actually spent the whole game in ''Sora'''s dreams.]]
* ''VideoGame/{{MARDEK}}'' had a dream reality in Chapter 3. It's not exactly walking through someone's mind, but it's shaped by human thoughts.
* This is the main gameplay gimmick of ''VideoGame/MarioAndLuigiDreamTeam''. Pi'illo Island has many magical pillows on which Luigi can fall asleep, creating a portal to the Dream World that Mario can enter. It's not just Luigi's dreams you can enter either. If you fall asleep next to someone, you end up in the same Dream World as them. Hence how you get to enter Big Massif's dream in Wakeport and [[spoiler:Bowser's Dream]] in the final dungeon.
* Entering other characters' dreams is required at certain points in the ''VideoGame/NeverwinterNights2'' expansion pack, ''Mask of the Betrayer''. The shaman Gannayev-of-Dreams has this power innately, and One-of-Many can learn to do this, depending on the player's actions.
* ''VideoGame/PathfinderKingmaker'': Used when Linzi, a bard who can send messages via dreams, and the [[EveryoneCallsHimBarkeep Storyteller]] concoct a spell that allows her and the PlayerCharacter to enter the BigBad's dreams.
* In ''VideoGame/PigletsBigGame'', the titular Piglet has the ability to visit the dreams of other Hundred Acre Wood denizens while they're fast asleep through a magic telescope, and the goal of the game is to help his friends with their problems within their dreams and fending off Heffalumps and Woozles along the way.
* In ''VisualNovel/SablesGrimoire'', both Eris the succubus and Raphael the angel can enter other people's dreams. They both enter Sable's dreams once during the common route, with Eris doing so more frequently in her own route.
* ''VideoGame/TwistedWonderland'': [[spoiler:Silver's]] unique magic allows him to travel into the dreams of people close to him. The magic can only be used during sleep and he can't control whose dream he ends up in.
* ''VideoGame/WildArms'':
** In ''VideoGame/WildArms1'', Cecilia was able to dream walk once in order to battle a dream demon named Elizabeth [[spoiler:who had been keeping Rudy trapped in his dreams]].
** ''VideoGame/WildArms3'' has The Saint who appears in the dreams of the leader of the Arc of Destiny, as well as the Dream Child from Shane's dreams. [[spoiler:In reality, they're both the Dream Demon Beatrice, using her dream walking powers to manipulate people for her ultimate goal of creating a Filgaia where she could live in]].
** In ''VideoGame/WildArms4'', the seller of the Black Market is implied to be a dream demon, with one of the [=NPCs=] in the city receiving nightly visits in his dreams by someone who tells him to go buy stuff from the Black Market. This would certainly explain why the Black Market deals in levels rather than money.
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/AliceAndTheNightmare'', the oneironauts, one of which Alice aspires to be, have this exact ability, to enter people's dreams and harvest their energy.
* ''Webcomic/{{Archipelago}}'' has a number of dream walkers:
** Prince Paollo is a highly skilled one as the crown prince of the Eastern Continent, where this and [[DreamWeaver dream weaving]] is a very respected talent.
** [[BigBad Snow]] does this as well, by stealing Paollo's power. He uses it to [[NightmareWeaver induce nightmares in his enemies.]]
** [[spoiler:Credenza]] turns out to be a dream walker, as well. She doesn't have a proper mentor, but [[spoiler: Tabitha and later Olivia]] give her tips and encouragement by [[TalkingInYourDreams dream conversations]].
* ''Webcomic/ChampionsOfFaraus'':
** Hypnoron, an Arcane god with DreamWeaver powers, is able to enter peoples dreams.
** Rougery, a trickster spirit, has the ability to magically “trance” a dream version of herself into the [[{{Dreamland}} Dreamscape]] Hypnoron controls.
* Alps like Tony and Yiska have this ability in ''Webcomic/CharbyTheVampirate''.
* ''Webcomic/CityOfSomnus'' is the sequel to ''Webcomic/{{Archipelago}}'' set in Paollo's native land of Majestan. Apart from him, there's a lot of new Dream Walker characters, as pretty much everyone in Majestan can do it to some extent.
* ''Webcomic/DreamingFreedom'': Siyun lucid dreamed so much he fell into a coma, and now he walks people's dreams to keep himself entertained.
* In ''Webcomic/TheDreamwalkerChronicles'' Kyle first meets [[spoiler:his future wife]] in a dream and it is also where he starts to learn about Flint's true nature.
* In ''Webcomic/ElGoonishShive'', a wizard enters Grace's dreams repeatedly [[http://www.egscomics.com/index.php?id=1830 in order to deliver an important message]].
* ''Webcomic/{{Homestuck}}'':
** [[ItMakesSenseInContext If a Sburb player's dream body is dead]], then any time they sleep, their consciousness travels to the Dreambubbles in [[EldritchLocation the Furthest Ring]]. This shared dreamscape also doubles as the afterlife for Sburb players--from every parallel timeline in existence. That makes ''a lot'' of folks capable of stepping into one's dreambubble.
** Wayward Vagabond is ''not'' a Sburb player, so he gets normal dreams when he sleeps. Somehow, god-tier Vriska Serket was able to jump into one of his dreams and talk to him (in Morse code) anyway. It probably has something to do with Vriska's psychic mind-control powers.
* ''Webcomic/LovelyLovecraft'': Anyone who enters the Dreamlands. Prominent examples include [[spoiler:Carter, Howard, and Hildred]].
* ''Webcomic/KillSixBillionDemons'': Incubus is able to do this. Unusually, it appears to be a power entirely unique to him and not caused by his [[CosmicKeystone Key]] or his training -- it is simply something he can do. He uses it to drop in on [[TheHero Allison]] in her dreams and play the role of EvilMentor to her.
* ''Webcomic/LegendOfTheBlueDiamond'': Dream Dwellers are wolves that go into the dreams of wolves near them. [[spoiler: Briar is a Dream Dweller.]]
* An example appears starting [[http://mansionofe.comicgenesis.com/d/20130617.html here]] in ''WebComic/TheMansionOfE'', though it's not clear who exactly is doing the walking.
* In ''WebComic/YokokasQuest'', Copycat was able to enter Mao's dream and converse with him, though Mao recognizes that he's an intruder, and [[GlamourFailure who he is from his eyes]]. Copycat implies that other people might either have accepted his appearance as being a regular part of their dream, or might have forgotten him after waking.
[[/folder]]

[[folder:Web Animation]]
* In the Platform/GoAnimate video ''Dora's 2nd Nightmare'', WesternAnimation/{{Caillou}} enters [[WesternAnimation/DoraTheExplorer Dora]]'s dream to find out why she's scared. He finds that she is in a nightmare where she is uncontrollably floating around a black void where [[VanityPlate logos]] play from out of nowhere. Eventually, Caillou gets scared and leaves the dream when an edited Feature Presentation bumper shows up. Later, in the video ''Dora's 3rd Nighmare'', we see that some guys, including the AuthorAvatar, are giving Dora the same kind of nightmare on purpose. They use some kind of dream computer system, which ends up getting hacked by a demonic [[Series/SesameStreet Big Bird]].
[[/folder]]

[[folder:Web Original]]
* ''Website/SCPFoundation'': SCP-990 is a shadowy man dressed in the most suspicious clothing possible, who seems to like appearing in the dreams of members of the SCP Foundation. In an interview, he mentions an SCP with a ''ten-digit number'' as being the bad guy when accused of threatening the Foundation, implying TimeTravel.
* ''Literature/WhateleyUniverse'': Characters which have a connection to the Astral, a.k.a the March of Dreams, both names for a kind of dream realm, may be able to do this. The Dream Team of Whateley Academy works to protect the dreams of the students from malign forces like evil spirits and other such things.
* ''WebVideo/{{Lucids}}'': Basically, what a Lucid is; the main characters can pretty much all go between other people's dreams and either observe or influence the dreams. They can even leave the dream that originally created them.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius'': In "I Dream of Jimmy", Jimmy journeys into Carl's dreams to help his friend deal with a recurring nightmare. As it turns out, [[RealDreamsAreWeirder Carl wasn't kidding when he warned Jimmy "My dreams aren't as logical as yours."]]
* The ''WesternAnimation/{{Aladdin}}'' episode "As the Netherworld Turns" had Abu and Iago use an enchanted crystal that appears to grant them the power to walk through walls, but actually sends them to the Netherworld. This is a big problem, because due to their intangibility, Aladdin and the others cannot see or hear them. Fortunately, with the help of Sultan's late father, who still haunts the palace, Iago and Abu learn that the only way to communicate to Aladdin and the others is to enter their dreams while they sleep.
* ''WesternAnimation/AmericanDragonJakeLong'' had an episode where Jake was in the dream realm thanks to a magical relic. He initially used it to date Rose while the two were forced apart. Then he wandered to other dreams, depicted as doors in a hallway.
* In ''WesternAnimation/DannyPhantom'', Danny discovers during Season 3 he can overshadow (possess) a person to enter their dreams, while battling a ghost who want to feed off dreams for power.
* Bill Cipher of ''WesternAnimation/GravityFalls'' is a [[PaperPeople two-dimensional]] inhabitant of a VoidBetweenTheWorlds called the Nightmare Realm, who interacts with the dimension Earth is located in by appearing in people's dreams. Whenever he appears before someone, the surroundings turn black and white, and when he leaves, people act like they've come out of a trance. When the Author first met him, it was while he was taking a nap after reading an incantation to summon Bill, and Bill shows up to harass him in his dreams several times after that. Worse still, Bill has RealityWarper powers [[DreamWeaver within the dreamscape]] and may even inflict DemonicPossession on those who foolishly make a [[DealWithTheDevil deal]] with him. Ironically, his ability to enter minds is also his greatest weakness, because [[spoiler:if he enters a mind and it gets [[LaserGuidedAmnesia wiped]] at the same time, Bill is erased along with it]].
* ''WesternAnimation/JackieChanAdventures'': The sheep talisman possesses the power of AstralProjection, which lets one [[SpiritWorld leave his body and become a spirit]] and also lets one enter dreams, which comes in handy several times on Jackie's adventures.
* ''WesternAnimation/JusticeLeague'', "[[Recap/{{JusticeLeagueS2E5And6OnlyADream}} Only a Dream]]", Martian Manhunter can enter people's sleeping minds.
* In the ''WesternAnimation/LooneyTunes'' short "The Big Snooze", Elmer Fudd has quit his position as Bugs' patsy and takes a nap, dreaming sweet dreams. Bugs decides to get in on it, goes to sleep, and enters Elmer's dream, turning it into a wacky, loud nightmare.
* Princess Luna from ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', first shown in the episode "[[Recap/MyLittlePonyFriendshipIsMagicS3E6SleeplessInPonyville Sleepless in Ponyville]]", has the ability to enter into the dreams of anyone who's having one. One of the duties of being Princess of the Night is to protect sleeping ponies from their nightmares, and to help them face the fears that are causing those nightmares. In "[[Recap/MyLittlePonyFriendshipIsMagicS4E20ForWhomTheSweetieBelleToils For Whom the Sweetie Belle Toils]]", Luna is shown as able not only to enter a pony's dream, but [[DreamWeaver redirect it]] to help them learn AnAesop.
** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]" shows that Luna is capable of pulling an entire town into a SharedDream. It's also shown that Luna created the Tantabus, a creature of shadow and nightmares to punish herself for her actions as Nightmare Moon.
* In the ''WesternAnimation/PoetAndersonTheDreamWalker'' short film, all dreams play out within the Dream World, which means that Dream Walkers can be involved with the affairs of other Dream Walkers. However, threats specific to one Dream Walker, such as Poet's Night Terror, can't be confronted by other Dream Walkers. The definition of a Dream Walker in the short film and [[ComicBook/PoetAndersonTheDreamWalker the comics]] is different from here, treating a Dream Walker as a Guardian type Lucid Dreamer.
* WesternAnimation/{{The Powerpuff Girls|1998}} discover that they have the ability to enter each other's dreams in "Dream Scheme" when the entire planet is forcibly put to sleep by a [[FaceHeelTurn malevolent]] Sandman. They later use this power again in "Power-Noia" after HIM [[DreamWeaver traps them in their own worst nightmares]].
* One ''WesternAnimation/RickAndMorty'' episode had Rick and Morty go into Morty's math teacher's dream. The results are... bizarre, [[MindScrew to say the least.]]
* ''WesternAnimation/SpongeBobSquarePants'' had an episode called "Sleepy Time", where [=SpongeBob's=] dream self falls out of his dream bubble and begins entering the dreams of the other characters, wreaking havoc along the way.
-->'''Squidward:''' Don't we get enough of you during the day?!
* In ''WesternAnimation/StevenUniverse'', Steven eventually discovers he has the power to enter other people's dreams. He first discovers this power when he makes telepathic contact with [[spoiler:Lapis Lazuli/Malachite]] in "Chille Tid", and he uses it deliberately in "Kiki's Pizza Delivery Service". Later on, this is implied to be done via AstralProjection.
* ''WesternAnimation/ToopyAndBinoo'':
** In "Diaper Dream", Toopy enters Binoo's dream to figure out what's causing his nightmare.
** In "Dreamland", Toopy enters Binoo's dream to figure out what's making him so happy.
[[/folder]]

[[folder:Real Life]]
* As shown on [[http://www.livescience.com/28436-computer-reads-dream-imagery.html Livescience]] and in [[http://www.sciencemag.org/content/340/6132/639.abstract the journal Science]], progress is being made on the decoding and imaging of dreams.
[[/folder]]
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