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Familial natural short sleep is a rare, genetic, typically inherited trait where an individual sleeps for fewer hours than average without suffering from daytime sleepiness or other consequences of sleep deprivation. This process is entirely natural in this kind of individual, and it is caused by certain genetic mutations.
A common form of biphasic or polyphasic sleep includes a nap, which is a short period of sleep, typically taken between the hours of 9 am and 9 pm as an adjunct to the usual nocturnal sleep period. Napping behavior during daytime hours is the simplest form of polyphasic sleep, especially when the naps are taken on a daily basis.
Familial natural short sleep (FNSS) is a distinct category of habitual short sleep. Individuals with this trait usually get 4–6.5 hours of sleep per day but do not have daytime sleepiness and do not need catch-up sleep on the weekends. After sleep deprivation, these individuals have less of a sleep deficit than individuals without FNSS.
Short sleep duration of less than seven hours is correlated with coronary heart disease and increased risk of death from coronary heart disease. Sleep duration greater than nine hours is also correlated with coronary heart disease, as well as stroke and cardiovascular events. [125] [126] [127] [128]
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 January 2025. Short period of sleep during typical waking hours For other uses, see Nap (disambiguation). A man napping in a hammock, on a patio in Costa Rica 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 ...
Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.
A power nap or cat nap is a short sleep that terminates before deep sleep (slow-wave sleep; SWS). A power nap is intended to quickly revitalize the sleeper. A power nap combined with consuming caffeine is called a stimulant nap, coffee nap, caffeine nap, or nappuccino. [1]
Karolina Olsson (29 October 1861 – 5 April 1950), also known as "Soverskan på Oknö" ("The Sleeper of Oknö"), was a Swedish woman who purportedly remained in hibernation between 1876 and 1908 (32 years). [1] This is believed to be the longest time that anyone has lived in this manner who then awoke without any residual symptoms. [2] [3]