What time does school start for your kids? Chances are it's before 8 a.m., scientists say that's too early.

According a CDC study the average school day starts at 8:03 a.m., and scientist say we should add another 30 minutes. 8:30 a.m. seems to be the sweet spot because the biggest problem is that kids are not getting enough sleep.

It's not hard figure out why that's a problem, lack of sleep causes risk to their health, safety, and grades.

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