Psychology / Unit 3 Psych 0297 short lesson, about 20 seconds
Melatonin
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The idea
Melatonin is a hormone released by the pineal gland as darkness falls, signaling the body toward sleep.
In practice
Melatonin rises in the evening and remains high through the night, falling before habitual waking.
Where people slip
Melatonin signals night, not sleepiness. It shifts timing more reliably than it produces sleep.
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