Melatonin is a hormone secreted by your pineal gland (located just above the center of your brain). During the day, the pineal gland is inactive. In the evening, melatonin levels rise sharply as your brain starts to recognize light reduction. The elevated levels continue for about 12 hours. The following morning, after a night of sleep, melatonin levels return to low daytime levels – barely detectable.
The body’s production of melatonin declines gradually with age. Many doctors believe that the loss in melatonin is associated with several age-related diseases, lowered sleep efficacy, and deterioration of the circadian rhythm.
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