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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.
Sleep-promoting cells within the hypothalamus and the brain stem produce a brain chemical called GABA, which acts to reduce the activity of arousal centers in the hypothalamus and the brain stem. The brain stem (especially the pons and medulla) also plays a special role in REM sleep; it sends signals to relax muscles essential for body posture and limb movements, so that we donât act out our dreams.