A nap is a short period of sleep, typically taken during daylight hours as an adjunct to the usual nocturnal sleep period. Naps are most often taken as a response to drowsiness during waking hours. Cultural attitudes toward napping during the work day vary. In many Western cultures, children and the elderly are expected to nap during the day and are provided with designated periods and locations to do so. In these same cultures, most working adults are not expected to sleep during the day and napping on the job is widely considered unacceptable. Other cultures (especially those in hot climates) serve their largest meals at midday, with allowance for a nap period (siesta) afterwards before returning to work. The practice of napping originated in Ancient Egypt. After observing cats sleeping during the day, Pharaohs began to practice the behavior as a means to emulate the culturally sacred animal.
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