Psychology / Psych 0297 · Atom · ~20 seconds
Melatonin
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Melatonin is a hormone released by the pineal gland as darkness falls, signaling the body toward sleep.
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Melatonin rises in the evening and remains high through the night, falling before habitual waking.
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Melatonin signals night, not sleepiness. It shifts timing more reliably than it produces sleep.