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. Melatonin is often called the sleep hormone because of its connection to sleep regulation. When it gets dark, melatonin levels begin to rise, signaling to the body that it is time to rest. This helps people fall asleep and maintain a restful sleep throughout the night.

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