melatonin [mel-uh-Toh-nin]
noun. a hormone secreted by the pineal gland in the brain to control sleep and wake cycles
"Studies have shown that the artificial lights emitted from smartphones disrupt the body’s production of melatonin, which can delay sleep for hours past your bedtime."
"Light affects how much melatonin your body produces. During the shorter days of the winter months, your body may produce melatonin earlier in the day than usual."
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