Understanding The Zombie Teen's Body Clock

Understanding The Zombie Teen's Body Clock
the girl sleeps. the alarm...
the girl sleeps. the alarm...

Many parents know the scene: The groggy, sleep-deprived teenager stumbles through breakfast and falls asleep over afternoon homework, only to spring to life, wide-eyed and alert, at 10 p.m. -- just as Mom and Dad are nodding off.

Fortunately for parents, science has gotten more sophisticated at explaining why, starting at puberty, a teen's internal sleep-wake clock seems to go off the rails. Researchers are also connecting the dots between the resulting sleep loss and behavior long chalked up to just "being a teenager." This includes more risk-taking, less self-control, a drop in school performance and a rise in the incidence of depression.

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