Use of a light-emitting electronic book (LE-eBook) in the hours before bedtime can adversely impact overall health, alertness and the circadian clock, which synchronizes the daily rhythm of sleep to external environmental time cues, according to Harvard Medical School researchers at Brigham and Women’s Hospital. These findings of the study that compared the biological effects of reading an LE-eBook to a printed book are published in the Proceedings of the National Academy of Sciences on December 22, 2014.
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