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Q. Do all people experience the post-lunch dip?
A. The effect may be natural, but “not everyone experiences it with equal intensity,” said David F. Dinges, a professor and sleep scientist at the University of Pennsylvania School of Medicine. A few people say they don’t feel the dip at all, while others — about 15 percent to 20 percent of the population, he estimates — are “closet nappers.” These are the ones who steal into empty rooms or their parked cars, or fall asleep at their desks, because they can’t fight off the urge to close their eyes.
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