It's ironic: When they're younger, you can't keep them from springing to life before 6 a.m. As teenagers, you can barely get them up for school.

Small children won't sleep in late to save their (or, more accurately, their parents') lives, but by the time they're old enough to savor their sleep, they have to get up early to go to school. When it comes to kids' sleep cycles, no one wins.

But research suggests it might be time to change that by switching up morning schedules and letting teens sleep in.

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