Most American teenagers are plagued by too little sleep, which can hurt their health and their school performance, federal health officials said Thursday.

Nearly 58 percent of middle school students in nine states and almost 73 percent of high school students across the country don’t get the recommended amount of nightly shuteye, according to a report from the U.S. Centers for Disease Control and Prevention.

“Children and adolescents who don’t get enough sleep are at increased risk for obesity, diabetes, injuries, poor mental health, and attention and behavior problems, which can affect them academically,” said report author Anne Wheaton, a CDC epidemiologist.

According to the American Academy of Sleep Medicine, children aged 6 to 12 need nine to 10 hours of sleep a night, while teenagers aged 13 to 18 should get at least eight hours per night, she said.

One sleep expert has a theory on why so many teens are short on shut-eye.

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