Your need to nap may be genetic—or a symptom of health trouble, reports Men’s Health.

So does that mean napping is the new cigarettes? Not even close, says Michael Grandner, Ph.D., director of the Sleep and Health Research Program at the University of Arizona.

Grandner describes napping as a symptom of a problem—not a problem in itself. “In many cases, people who nap do so because their sleep is poor at night and they can’t maintain wakefulness during the day,” he explains.