Melatonin is a hormone produced by the pineal gland that helps regulate the sleep-wake cycle and promote restful sleep. It plays a crucial role in maintaining the body's internal clock and is involved in the regulation of various biological rhythms, such as the sleep-wake cycle and seasonal changes. Melatonin levels rise in the evening, signaling the body to prepare for sleep, and decline in the morning, promoting wakefulness and alertness.

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