A pretty decent sized study. Makes you want to consider moving to siesta countries...
New research on napping provides the perfect excuse for office slackers, finding that a little midday snooze seems to reduce risks for fatal heart problems, especially among men.
In the largest study to date on the health effects of napping, researchers tracked 23,681 healthy Greek adults for an average of about six years. Those who napped at least three times weekly for about half an hour had a 37 percent lower risk of dying from heart attacks or other heart problems than those who did not nap.
The researchers said naps might benefit the heart by reducing stress, and jobs are a common source of stress.