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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.
Commonly-known neurotransmitters include: 1  Acetylcholine â The first discovered neurotransmitter, this chemical plays an important role in REM sleep. 2  Dopamine â Dopamine is associated with reward-inducing brain mechanisms, and has an inhibitory effect on signals traveling across neurons.