In fact, none of those appeared to make a difference. Twenge’s group also looked into whether TV watching, homework or after-school jobs were linked to falling sleep time. That’s compared to students who spent only an hour a day on such devices. Teens who used electronic devices at least five hours a day were 50 percent more likely not to get enough sleep, they found. Her team now suspects teens are increasingly foregoing sleep for texting, using social media or watching videos on their phones. population went up sharply, Twenge notes. ![]() Twenge and her team think smartphones have something to do with teens’ diminishing sleep.īeginning around 2009, smartphone use among the general U.S. That’s also about 17 percent more teens than slept fewer than seven hours nightly just six years earlier. That’s at least two hours less than experts recommend. ![]() In 2015, more than four in every 10 adolescents logged fewer than seven hours of sleep a night. Together, those surveys included data on some 370,000 teens. Each had asked students about their sleep habits. data from two long-running national surveys. ![]() The researchers scouted for changes over time in teens’ online activity and sleep patterns. Her team shared its findings in the November issue of Sleep Medicine. A psychologist who works at San Diego State University in California, she is the lead author of the new study. “Lack of sleep is linked to depression, anxiety, poor school performance and obesity,” says Jean Twenge.
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