%%%
%%
%% This page has been alphabetized. Please add new examples in the correct order.
%%
%%%
Most characters, like most [[RealLife people]], live one life beginning to end. While TimeTravel, [[AnotherDimension Alternate Dimensions]] and the occasional FreakyFridayFlip can complicate things, they are still more or less one person, starring in one life, for one lifetime.

Except when they're not. Because every now and then, a story stars a character who lives multiple lives, not [[RebirthAndReincarnationTropes serially]], but alternating between them one day at a time. It's not that they [[{{Elseworld}} leave one and travel to the other]]; they physically exist continually in each world, but their consciousness alternates between them.

These separate lives may take place spread out across time or in {{Alternate Universe}}s. The character will often have to gather information between their lives in order to advance the plot. Their unique circumstance makes it possible to talk to people that died in one universe before they could deliver important news or lets the main character save someone in one universe by figuring out who killed them in the other.

Often, the switch between lives happens each time the character falls asleep, making this trope related to DreamLand with elements of AllJustADream and OrWasItADream

Sister Trope to NonLinearCharacter.

Not to be confused with AlternateSelf, where the two lives are lived by two similar ''but separate'' people who happen to look alike and have the same name. Compare with {{Reincarnation}}. Contrast with LivingADoubleLife and SplitPersonality where the "multiple lives" are discrete aspects of a single life kept apart by design or mental disorder.

For the video game trope involving extra lives that allow the player character to survive otherwise fatal encounters, see OneUp.

----
!!Examples:
[[foldercontrol]]

[[folder:Fan Works]]
* In ''[[https://www.fanfiction.net/s/6359046/1/Sleepless Sleepless]]'' every time Harry fell asleep he ended up in an alternate universe where he had to defend their version of the Malfoys against an attempt to legally execute them.
* In the ''Series/{{Sherlock}}'' fic [[https://archiveofourown.org/works/334557/chapters/540728 "The World on His Wrist"]], John Watson begins waking up to the lives-in-progress of 4 very different John Watsons after he is wounded in combat with the RAMC in Afghanistan. At first, it's all he can do to juggle four confusing lives without being caught out. But once he gets the hang of it, he uses the various lives for escapism, to gather information, and to save lives as a doctor and a soldier and something like a non-costumed superhero... and then he meets Sherlock Holmes.
[[/folder]]

[[folder:Film — Live-Action]]
* In ''Film/DarkCorners'' a woman alternates between the lives of an affluent young woman about to get married and a mortician's assistant living in a squalid apartment in a dangerous neighbourhood, never sure which is real and which is a dream.
* In ''Film/TwilightZoneTheMovie'', a racist man is shuttled back and forth in time to live lives as a black, Jewish, and Asian person. He was supposed to learn a moral, but [[RealLifeWritesThePlot due to the death of the actor while filming an action scene]], he gets sent off to the gas chamber as a Jew during UsefulNotes/WorldWarII.
[[/folder]]

[[folder:Literature]]
* The central premise of Creator/TedDekker's ''Literature/TheCircleSeries'' is that Thomas Hunter receives a head injury and wakes up in another world. The action is then split across "our world" and that other world: every time Hunter falls asleep in one, he wakes up in the other.
* Creator/PhilipJoseFarmer's science-fiction novel ''Dayworld'' had as its premise that the entire world was divided into seven populations which took turns being active one day of the week each, while the other six are in stasis. The protagonist is a man who illegally maintains separate lives in each of the seven days.
* In the short story "Literature/TheOtherWife" by Jack Finney, a man discovers a way to travel between alternate realities. In each one he is married to a different wife, and when he finds himself getting bored with one he returns to the other.
* In ''Literature/WelcomeToJapanMsElf'', Kazuhiro thinks he was [[AllJustADream just having dreams]] of the same fantasy world since childhood, with him waking up if he sleeps or dies in that world. It isn't until the first chapter that he realizes that he is actually experiencing this trope, when he shields Marie from a dragon's fire and accidentally teleports her into his bedroom in Japan.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/Awake2012'': Main character Detective Britten suddenly begins switching between two universes every time he falls asleep after a car crash kills his wife in one universe and his son in the other. While his therapists in each universe try to convince him that the other universe is just a trauma-induced dream, he isn't so sure. Across the two lives, he begins to notice suspicious coincidences which he investigates seeking an explanation for what's happening to him which leads him to the heart of a dangerous conspiracy where he needs the time and information from both lives just to stay one step ahead of his enemies.
* ''Series/DoctorWho'' has had several examples of this in its run:
** In [[Recap/DoctorWhoS17E2CityOfDeath "City of Death"]], it's revealed that the MonsterOfTheWeek, the Scaroth, is living multiple lives throughout Earth's history simultaneously, and using his shared knowledge of these lives to further his plans.
** In [[Recap/DoctorWhoS31E7AmysChoice "Amy's Choice"]], the Doctor, Rory and Amy keep going back and forth between two lives — one where they're all on the TARDIS and one where Amy & Rory are living on Earth & she's pregnant — and have to decide which is the "right" timeline.
* ''Series/TheOuterLimits1995'': In "Tempests", Commander John Virgil, the first officer of the spaceship ''Tempest'', is infected with the venom of a giant alien spider which causes him to hallucinate. His perspective begins to switch between two mutually exclusive realities: one in which he is hailed as a hero for delivering the serum that eliminated the virus Ellycia C that was devastating his home colony and one in which he must repair the severely damaged ''Tempest'' so that it can bring the serum to the colony. He must decide which is real and which is the illusion. [[spoiler: It turns out that neither is real and that the unconscious Virgil is trapped aboard the ''Tempest'' being fed on by one of the spiders, as are the rest of the crew.]]
* In the ''Series/StargateSG1'' episode "The Changeling", Teal'c alternates between his life at Stargate Command and another life where he and the other SG-1 members are firefighters. Both seem equally real. [[spoiler:In truth, neither is real. He's hallucinating due to sharing his symbiote with Bra'tac after they were both shot during an ambush by Anubis' forces.]]
* In the SeriesFinale of ''Series/StarTrekTheNextGeneration'', Captain Picard is living in three alternate timelines, one in his past, one in his present, and one in his future, at the same time, and has to use information gathered in certain timelines to aid others.
* ''Series/TheTwilightZone1959'': In "[[Recap/TheTwilightZone1959S1E23AWorldOfDifference A World of Difference]]", Arthur Curtis finds himself switching between two worlds - one where he's a normal businessman and another where he's an alcoholic actor named Gerry Raigan who's playing the role of businessman Arthur Curtis in the film ''The Private World of Arthur Curtis''.
[[/folder]]

[[folder:Visual Novels]]
* Sigma and Phi in ''VisualNovel/VirtuesLastReward'' can send their consciousness across multiple realities, where certain major events have happened differently (their physical representation still lives through and experiences these events, but their mind can go just about anywhere in the course of the AB Game). After jumping to a new reality, they can occasionally retain some knowledge of what they've learned without knowing how they know it, to push the plot of that reality forward. By the end of the game, they're fully aware of this, and use it to their advantage multiple times.
[[/folder]]

[[folder:Webcomics]]
* ''Webcomic/{{Homestuck}}'': One of the features of SBURB is that players have an additional body, their dream self, who begins the game in a tower on Prospit or Derse. Once the player awakens their dream self (usually via a personal epiphany or extreme shock) their consciousness will shift between both bodies: when you sleep in one, you immediately wake up in the other. There are a few variations on this setup [[spoiler:such as Dirk Strider, who's fully awake in both bodies, simultaneously.]]
* This is how the different arcs of ''Webcomic/ArthurKingOfTimeAndSpace'' work; Arthur's consciousness shifts between them, but all these worlds are real and exist even when "our" Arthur's consciousness isn't there. This is only fully clarified in the [[http://www.arthurkingoftimeandspace.com/3518.htm final strip]], when Morgan explains "We don't just go from one time to the next. We genuinely belong in all of them."
[[/folder]]
----