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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.
Cerebrospinal fluid (blue) flows through the brain and clears out toxins through a series of channels that expand during sleep.Maiken Nedergaard. A mouse study suggests that sleep helps restore the brain by flushing out toxins that build up during waking hours. The results point to a potential new role for sleep in health and disease. Scientists and philosophers have long wondered why people sleep and how it affects the brain. Sleep is important for storing memories. It also has a restorative function.