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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.