A Samsung Electronics Co. representative displays the new Galaxy Note Edge smartphone for the media in New York, U.S., on Wednesday, Sept. 3, 2014. Samsung Electronics Co. unveiled a pair of Galaxy Note smartphones, including one with a display extending down the side, as the No. 1 seller tries to fend off Apple Inc.s push into large-screen devices. Photographer: Victor J. Blue/Bloomberg via Getty Images
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Teens who use tech with back-lit screens — including laptops, tablets, smart phones or TV screens — tend to suffer from bad nights of sleep, researchers said Monday. The study of 10,000 16- to 19-year-old boys and girls suggest that teens who used devices for more than four hours during the day, then they were 49 percent more likely to take longer than one hour to fall asleep. The study also suggested that looking at a screen for more than two hours after school, or using multiple devices, were both detrimental to sleep.
