Study: Reading from tablets before bed alters sleep cycles

December 25, 2014 6:30 AM

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A study has found that reading from a light-emitting device, such as an e-reader, before bedtime can shift your body's natural clock and delay the onset and characteristics of your sleep. And that could leave you feeling groggier the morning after, according to the study published online Monday in the journal Proceedings of the National Academy of Sciences.

A dozen people checked into the sleep lab at Boston's Brigham and Women's Hospital and stayed for two weeks. During that time, each spent five consecutive evenings reading a book for four hours under reflected light, and five evenings viewing an iPad for the same duration (the order of the five-day ...

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