Research : an additional 20 million Americans suffer that day from chronic sleep disorders . So it seems there is some truth to the phrase `` power nap . '' Rejuvenate Spa in Georgia , Georgia , charges clients for nap therapy . Expert : two to four hours of napping can improve performance yearly . Still , short nap not going to make up for a long-term sleep deficit , expert says .
Research : an additional 20 million Americans suffer that day from chronic sleep disorders . Rejuvenate Spa in Georgia , Georgia , charges clients for nap therapy . Expert : two to four hours of napping can improve performance yearly . Still , short nap not going to make up for a long-term sleep deficit , expert says .