After a summer of vacations and late nights, it's time to set those back-to-school alarms.

A good night’s sleep helps students stay focused and attentive in class. Experts say it's worth easing kids back into a routine with the start of a new school year.

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“We don't say ‘get good sleep’ just because,” said pediatrician Dr. Gabrina Dixon with Children's National Hospital . “It really helps kids learn and it helps them function throughout the day.”

The amount of sleep kids need changes as they age. Preschoolers should get up to 13 hours of sleep. Tweens need between nine and 12 hours. Teenagers do best with eight to 10 hours of shut-eye.

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