I am often confused when people refer to dreams in the same night as separate experiences. I used to assume that a typical night involved something like one long dream with an incoherent storyline, and I assumed that gaps in memory often made it difficult to connect certain "scenes" (logically or chronologically) after waking up. By the way, I do not have great dream recall. I read something like "the average person has 3-5 dreams every night" on Wikipedia, and I've read stories where people say they have multiple lucid dreams in one night. So I was wondering what defines the "boundary" between multiple dreams, if it isn't waking up. I guess there are physiological signs like REM sleep, but Wikipedia only says that "most" dreams occur during REM sleep.