Quick answer
Melatonin: definition
Melatonin is a hormone released by the pineal gland in darkness that signals nighttime to the body and helps regulate the timing of sleep.
Melatonin, explained
Bright light in the evening suppresses melatonin. Supplemental melatonin is most studied for circadian timing problems such as jet lag and delayed sleep phase.
Why it matters
Dim evening light supports natural melatonin release and sleep onset.
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Melatonin FAQs
What is Melatonin?
Why does Melatonin matter?
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