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READING BOOKS ON ELECTRONIC DEVICES before bedtime disrupts the body’s natural sleep rhythms, according to research published in the Proceedings of the National Academy of Sciences. In the study, 12 people read a book on an electronic device for 4 hours before bed, in a dimly lit room, for 5 consecutive nights. On another 5 nights, they read a real printed book on the same schedule. When using an electronic device, they were less drowsy, took longer to fall asleep, and were less alert in the morning. According to the researchers, use of electronic devices suppressed melatonin levels, making it more difficult to get a good night’s rest.