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The science is clear that teenagers need more than eight hours of sleep a night. The nation's pediatricians say school districts need to buck up and change schedules to let kids sleep later.
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Scientists agree that teenagers naturally go to bed late and sleep late, too. But high school start times are traditionally very early. Proponents of later start times say they're finally getting traction. The result, they say, will be happier kids who do better in school.