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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.
The number of minutes passed is the sleep onset latency at that particular hour on that particular day. [1]: 340 Dement advises against doing these evaluations at night when sleep onset latency can naturally be lower, particularly in older people.
Napping behavior during daytime hours is the simplest form of polyphasic sleep, especially when the naps are taken on a daily basis. The term polyphasic sleep was first used in the early 20th century by psychologist J. S. Szymanski, who observed daily fluctuations in activity patterns. [2] It does not imply any particular sleep schedule.
The sleep latency (time between the start of the nap opportunity and sleep onset determined by EEG) is determined for each of the four or five nap opportunities. If no sleep occurred during a nap opportunity, the sleep latency is recorded as 20 minutes for that nap opportunity. The average of sleep latency from the four or five naps is taken as ...
EDS can affect the ability to function in family, social, occupational, or other settings. [1] [2] A proper diagnosis of the underlying cause and ultimately treatment of symptoms and/or the underlying cause can help mitigate such complications. [3] According to the National Sleep Foundation, around 20 percent of people experience EDS. [4]
The 20 and 30-minute periods of sleep showed evidence of sleep inertia immediately after the naps and improvements in alertness more than 30 minutes later, but not to a greater level than after the 10 minutes of sleep. [3] Power naps are effective even when schedules allow a full night's sleep. [4]
Chronotype can affect how sleep deprivation influences mood. Those with morningness (advanced sleep period or "lark") preference become more depressed after sleep deprivation, while those with eveningness (delayed sleep period or "owl") preference show an improvement in mood. [62] Mood and mental states can affect sleep as well.
Sleep plays a vital role in regulating metabolism and appetite. When sleep deprived, the metabolic system will be out of balance, which will ultimately affect the dietary choices people make. Teens who are sleep deprived crave more carbohydrates. Sleep deprivation is a risk factor for obesity among young adults. [7] [medical citation needed]
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