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1 Serotonin is a chemical that affects mood, emotion, sleep and appetite. 2  Many antidepressants affect the amount of serotonin in the brain, and can also affect a personâs sleep.3  People beginning treatment with a new antidepressant may feel drowsier than usual for the first couple of weeks. Serotonin is a chemical that affects mood, emotion, sleep and appetite. 2  Many antidepressants affect the amount of serotonin in the brain, and can also affect a personâs sleep.
According to the activation-synthesis theory, dreams are merely the brain's reaction to random biological processes that occur during sleep. Various parts of the brain-in particular the pons, part of the brain stem-continue to function and produce stimuli during sleep and REM sleep in particular.