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This is Scientific American 60-Second Health. I'm Dina Fine Maron. Got a minute?

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When you curl up in bed, consider reading an old-fashioned printed book rather than a smartphone or tablet.

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Your sleep should be deeper and more restful.

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That's the finding of a study in the Proceedings of the National Academy of Sciences.

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Researchers had 12 healthy young adults read either a printed book or an iPad for four hours before bed during five consecutive evenings.

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During the fifth night blood samples were collected every hour via an IV during both the reading and sleeping periods.

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The research team assessed sleep time and REM cycles, and the subjects self-rated their sleepiness every evening and morning.

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All participants read for five nights on the iPad and for five from a book.

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As anticipated, reading print made for better Zzzs.

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Participants reading the iPad took about ten minutes longer to fall asleep, secreted less sleep-inducing melatonin, and shifted their internal circadian clock.

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They also reported feeling more tired the next morning.

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The study's first author, Anne-Marie Chang, then of Boston's Brigham and Women's Hospital, says that devices like the original Kindle, that do not produce their own light, should likely still be a good choice for bedtime reading.

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But when it comes to those backlit gadgets, probably best to read those over your morning coffee.

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Thanks for the minute, for Scientific American 60-Second Health. I'm Dina Fine Maron.

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