Michael Arnott, of Cambridge, Mass., says he used to have trouble staying awake on long drives. Sleep specialists discovered he has obstructive sleep apnea, though not for the most common reasons — he isn't overweight, and doesn't smoke or take sedatives. M. Scott Brauer for NPR hide caption

itoggle caption M. Scott Brauer for NPR

Sleepy in the day and wide awake at night? Give the screen a rest. Guido Mieth/Getty Images/Flickr RM hide caption

itoggle caption Guido Mieth/Getty Images/Flickr RM

About 40 percent of high schools start before 8 a.m., which contributes to chronic sleep deprivation among teens, according to the American Academy of Pediatrics. Chris Waits/Flickr hide caption

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Teenagers' sleep patterns may be a clue to their risk of depression. iStockphoto hide caption

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Daniel Horowitz for NPR

Solid friendships can help buffer life's stress. iStockphoto hide caption

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Maggie Starbard / NPR

It may not be the best strategy to stay up late and cram. A new study finds that when teens don't get the sleep they need, all kinds of things can go poorly. iStockphoto.com hide caption

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Jealous? If you have trouble sleeping, several new apps and devices promise to help you figure out why. In this photo from January, Huan Huan, a female giant panda, sleeps in a zoo in Beauval, France. Franck Prevel/Getty Images hide caption

itoggle caption Franck Prevel/Getty Images

Sleepy police were likelier to fall asleep while driving, a new survey of nearly 5,000 officers in the U.S. and Canada finds. About 40 percent of officers surveyed reported sleep disorders, with various health implications. Sean Locke/iStockphoto hide caption

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Sleep researchers say parents of a new child can be a risk for long-term insomnia. Timothy M. Black/iStockphoto.com hide caption

itoggle caption Timothy M. Black/iStockphoto.com