Melatonin is a hormone that your brain produces in response to darkness. It helps with the timing of your circadian rhythms (24-hour internal clock) and with sleep. In other words, it regulates the sleep-wake cycle.
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✅ Melatonin levels rise about two hours before bedtime.
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✅ Being exposed to light at night can block melatonin production.
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✅ Melatonin production declines with age.