Gerber said, “There are at least eleven (almost definitely more) neurotransmitters and hormones that play intimate roles in the sleep-wake cycle.” He named GABA, Orexin, Glutamate, Acetylcholine, Norepinephrine, Dopamine, Adenosine, Corticotropin-releasing hormone, Growth hormone-releasing hormone, Cortisol, serotonin and, of course, melatonin. Of course, some of these names are more widely known than others.
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