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- In the Green Knight, the knight and the princess had at first seen each other in dreams, many times.
- Dreamscape is about the government setting up a program to train psychics to do this intentionally on behalf of the government, as well as occasionally engage in the odd dream-assassination or two.
- The job description of Extractors in Inception. While they're asleep, they are able infiltrate other people's dreams and then manipulate them to think about whatever secret the the Extractor's trying to steal. The secret will then show up somewhere in the dream, where the Extractor can study it and remember it when he wakes up.
- Harry Potter, most frequently in the fifth book. Harry's connection to Lord Voldemort allows him to "see" what the Dark Lord is up to, but it sometimes goes both ways. It is twisted when Voldemort plants a false dream to trick Harry into rushing into battle at the Department of Mysteries.
- Happens almost once a chapter in Percy Jackson and the Olympians—Percy eavesdrops on villains' conversations pretty much every time he dreams (which is a lot), although the aversion of As You Know means the information he gathers is rather cryptic. Played with in the third book, when one villain reveals she let Percy listen in on the conversation specifically to kill his morale.
- The Fellowship of the Ring.
- While sleeping in Tom Bombadil's house Frodo dreams of Gandalf being rescued from Orthanc. Gandalf later tells him that he had the dream after it had already happened (according to the official chronology, about nine days later).
- While in the Prancing Pony Inn, Frodo dreams of a horn blowing the same night horns were blown in Crickhollow to warn of the presence of the Black Riders.
- The Wheel of Time series, in an indirect way. The dream world has none of the people that the physical world does, but inanimate objects are still there so some of the Aes Sedai would read reports from their enemy's desks, though the papers would disappear if they were moved in the real world while they were reading them.
- In The Black Company, one character gets temporarily dislodged from his body (the enemy wizard was being an asshole) and upon returning discovers that he can do astral travel whenever asleep. This becomes a major plot point.
- Happens fairly frequently in the Tawny Man trilogy, as a side effect of Fitz having the Skill. Prince Dutiful also seems to have experienced this, and since Nettle's primary Skill-ability is control over dreams, it's likely that it's happened to her as well.
- Jane Studdock in C. S. Lewis's That Hideous Strength discovers she has this ability. It also turns out that one of the bad guys, Prof. Frost, is capable of spying on her dreams.
- In Blood of the Mantis, Acheous uses this to find the box.
- In the early chapters of The Pilo Family Circus, Jamie ends up being stalked in his dreams by the Clown Division, who are trying to figure out where he lives. Much to his horror, they succeed. It's also revealed that this is an ability on loan from the Fortune Teller, as Gonko is heard to mutter, "Goddamn, this Dream-Stalking is a con job. How many bags did that skag charge us for this?"
- Bran from A Song of Ice and Fire has "wolf dreams", where he sees the world through the eyes of his direwolf. This happens to Jon, too.
- Jayfeather in Warrior Cats has the ability to walk in dreams, so he uses this to walk in other cats' dreams, mainly that of the other medicine cats when they speak with their deceased ancestors. Leafpool tries to make him do this once to figure out where his sister is when, as an apprentice, Hollyleaf goes missing.
- In Jennifer Crusie's Maybe This Time, Flo claims that her dreaming of Andie's falling into a well shows that Andie is repressing something in her unconscious.
- In Andre Norton's Ice Crown, Roane dreams of what is happening in court. Later, Nelis can confirm it because she can describe court mourning, which the people had been wearing, but she had never seen outside the dream.
- In Andre Norton's Storm Over Warlock, both Thorvald and Shann dream beside the river. Shann asks Thorvald whether the survey had found a mountain shaped like a skull, as in his dream.
- In Wet Goddess, Zack's nightmare turns out to be a vision sent to him by Ruby.
- In The Witchlands, Esme can spy on Iseult's surroundings when the latter's asleep. Iseult also gets a peek at Esme's location.
Live Action TV
- Game of Thrones: Jojen saw Ned's execution in a dream. He only tells us this long after the fact, though.
- Happens in Star Trek: Enterprise with Trip and T'Pol having some sort of weird link. While she is meditating and Trip is day-dreaming they both meet up in a white blank space. Neither of them consciously wanted to be in each other's thoughts but were due to Vulcan psychic links (note ).
- Medium is a detective show about a psychic who solves crimes. Her visions range between premonitions (dreaming of murders that haven't happened yet) and this (dreaming of the murderer while he's killing his victim).
- Angels in America has the "threshold of revelation," a sequence where Harper turns up in Prior's dream and Prior turns up in Harper's hallucination. They actually have an extensive conversation, but end up revealing details to each other that they normally would have no idea of (Harper knows Prior's dying of AIDS, Prior can tell Harper's husband is gay).
- Not exactly spying, but the Warden and Alistair in Dragon Age: Origins can sometimes glimpse the size and movements of the Darkspawn horde in their dreams.
- The whole point of Dreamless is that each of the main characters dream the life of the other one while they sleep.
- This is what leads to Supergirl discovering the existence of her clone Galatea in Justice League Unlimited.