A nap is a short period of sleep, typically taken during daytime hours 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 period. For years, scientists have been investigating the benefits of napping, including the 30-minute nap as well as sleep durations of 1–2 hours. Performance across a wide range of cognitive processes has been tested.[1]
- ^ Rosekind MR, Smith RM, Miller DL, Co EL, Gregory, Webbon LL, et al. (December 1995). "Alertness management: strategic naps in operational settings". Journal of Sleep Research. 4 (S2): 62–66. doi:10.1111/j.1365-2869.1995.tb00229.x. PMID 10607214. S2CID 23583942.