Researchers messed around with the start times of high schools in three states and found that the schools that switched to later start times saw an improvement in student grades, attendance, and overall student health.

Standardized test scores improved across the board, in math, English, science, and social studies.

And as an added bonus, students with later starts also consumed less caffeine.

66 percent of students at high schools that started at around 9 a.m. got the recommended eight or more hours of sleep.

But at schools that started at 7:30 a.m., only 34 percent of students got the recommended amount of sleep. (

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