Melatonin secretion regulates the body’s circadian rhythms while synchronizing the sleep-wake cycle throughout the day. For example, melatonin levels are lowest during the day and peak during the evening when it is dark. Melatonin release is correlated with the time of day. ![]() ![]() ![]() ![]() Melatonin is a hormone naturally produced by the central nervous system in the pineal gland, which is located in the brain.
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