enough sleep at night it will be another fragment, segment that will not help you. if you look at the history of this country, from albert einstein to edison to john f. weekend to george w. bush, these guys took afternoon naps and actually helped them. i grew up taking afternoon naps and always hated it, when my mom made me do it but it worked because it shows, most of the studies, that your cognitive skills, memory and your efficiency boosts. if you look at the sleep cycle, two hours, go from short sleep to longer one and then, finally into deep sleep, the rem where you have the dreams, you don't want to take a 45-minute nap, you are really deep and if someone wakes you, you are groggy and it makes you more tired. >> jamie: the risk of the longer nap, worth warning people about. >> absolutely and recent studies show they are restorative at 45 minutes, of memory but as david