Melatonin is a hormone that plays a key role in regulating the sleep-wake cycle. It is produced by the pineal gland, a small gland located in the brain. The production of melatonin is influenced by light and darkness, with the body producing more melatonin in response to darkness and less when exposed to light. This makes melatonin a crucial part of the body's natural circadian rhythm, which is the internal clock that tells us when it is time to sleep and when to wake up.

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