Study concludes that most Americans go to sleep later on Friday, Saturday, and Sunday nights. Delayed bedtimes are especially pronounced for teens and young adults. Findings add evidence to support recent pushes for later school start times, say researchers.

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Study concludes that most Americans go to sleep later on Friday, Saturday, and Sunday nights. Delayed bedtimes are especially pronounced for teens and young adults. Findings add evidence to support recent pushes for later school start times, say researchers.