Later Start Times for High School Students | CEHD | U of M - 2 views
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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.
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shaila a on 18 Oct 13It may be a justification for a late start of school day for teeagers.
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