A nap a day could save your life, according to an article in a recent issue of Parade magazine.

A study at the University of Athens Medical School points to the benefits. Researchers compared Greek men hospitalized for coronary heart disease with Greek men hospitalized for other reasons and concluded that those who nap at least 30 minutes a day are 30 percent less likely to suffer heart problems than those who don't nap."Our society looks down on naps," says David Dinges, a psychologist at the University of Pennsylvania who specializes in the study of napping.

"We regard time as money and see napping either as wasteful and self-indulgent or as a sign of a mental or physical defect."

Despite the stigma, Dinges says about one-third of Americans do nap at least once a week, and 55 percent of college students nap regularly.