If you're dragging this morning because you've lost an hour of sleep over the weekend, then today is for you. It's National Napping Day, which brings awareness to the health benefits of, well, napping. A recent article in the Journal of Occupational and Environmental Health said that fatigued workers cost employers $136.4 billion a year in lost production. Moreover, a NASA study shows that a few winks after lunch can boost worker's output by as much as 34 percent. So grab some ZZZs!