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1 .This is Scientific American 60-Second Health. I'm Dina Fine Maron. Got a minute?
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2 .When you curl up in bed, consider reading an old-fashioned printed book rather than a smartphone or tablet.
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3 .Your sleep should be deeper and more restful.
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4 .That's the finding of a study in the Proceedings of the National Academy of Sciences.
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5 .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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6 .During the fifth night blood samples were collected every hour via an IV during both the reading and sleeping periods.
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7 .The research team assessed sleep time and REM cycles, and the subjects self-rated their sleepiness every evening and morning.
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8 .All participants read for five nights on the iPad and for five from a book.
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9 .As anticipated, reading print made for better Zzzs.
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10 .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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11 .They also reported feeling more tired the next morning.
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12 .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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13 .But when it comes to those backlit gadgets, probably best to read those over your morning coffee.
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14 .Thanks for the minute, for Scientific American 60-Second Health. I'm Dina Fine Maron.
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