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"From the onset of puberty until late teen years, the brain chemical melatonin, which is responsible for sleepiness, is secreted from approximately 11 p.m. until approximately 8 a.m., nine hours later. This secretion is based on human circadian rhythms and is rather fixed [by exposure to sunlight]. In other words, typical youth are not able to fall asleep much before 11 p.m. and their brains will remain in sleep mode ...more »
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