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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.
Other sleep scientists point to research that suggests that sleep replays and consolidates significant memories. Some recent research points out that during sleep, some nerves send their electrical impulses in the opposite direction they normally do when you are awake. We're not too sure why they do this. And other current research says that sleep gives the brain the opportunity to flush out the various metabolic waste products created during the day. If you look at the brain, there's a lot of obvious anatomical stuff â the nerve cells, the glial cells that support the nerve cells, the arteries and veins, and the cerebrospinal fluid (or CSF) that keeps the brain afloat.