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

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Even if you're under 25, you should still know your blood pressure, a study says. Rudyanto Wijaya/iStockphoto hide caption

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Smoking can mess up your looks, according to an ad campaign aimed at keeping teens from smoking. Courtesy of U.S. Food and Drug Administration hide caption

itoggle caption Courtesy of U.S. Food and Drug Administration

You can do it. But your 16-year-old can't. Teens were more likely to have accidents while eating or talking in the car. iStockphoto hide caption

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Almost half of high-schoolers have had sexual intercourse, but teens almost never ask their doctors about sexual health. Nicole Young/iStockphoto hide caption

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

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When researchers at Weill Cornell Medical College scanned teenage brains, they found that the area that regulates emotional responses has to work harder to keep impulses in check. Courtesty Kristina Caudle/Developmental Neuroscience hide caption

itoggle caption Courtesty Kristina Caudle/Developmental Neuroscience

Beer pong and other drinking games are popular among teenagers, and play a role in binge drinking. iStockphoto.com hide caption

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