When you curl up in bed, consider reading an old-fashioned printed book rather than a smartphone or tablet. Your sleep should be deeper and more restful. That’s the finding of a study in the Proceedings of the National Academy of Sciences. [Anne-Marie Chang et al, Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness] Researchers had 12 healthy young adults read either a printed book or an iPad for four hours before bed during five consecutive evenings. During the fifth night blood samples were collected every hour via an IV during both the reading and sleeping periods.
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