what is considered a nap
A nap is a short period of sleep, typically taken between the hours of 9am and 9pm as an adjunct to the usual nocturnal sleep period. Naps are most often taken as a response to drowsiness during waking hours. A nap is a form of biphasic or polyphasic sleep, where the latter terms also include longer periods of sleep in addition to one single period. Cultural attitudes toward napping during the work day vary.