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Practice Speaking: Read Aloud ID: #451 Long Midday Siesta 4
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"Napping may help deal with the stress of daily living," said Michael Twery, who directs the National Heart Lung and Blood Institute's National Centre on Sleep Disorders Research. "Another possibility is that it is part of the normal biological rhythm of daily living. The biological dock that drives sleep and wakefulness has two cycles each day.

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