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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.
Human babies have 8 hours of REM sleep and 8 hours of NREM sleep on an average. The percentage of time spent on each mode of sleep varies greatly in the first few weeks of development and some studies have correlated this to the degree of precociality of the child. [45]
No, four hours of sleep is not enough for the average person. The minimum amount of sleep recommended for adults by the American Academy of Sleep Medicine is seven hours. These recommendations are ...
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]
The average sleep time of the platypus in a 24-hour period is said to be as long as 14 hours, though this may be because of their high-calorie crustacean diet. [ 72 ] Aquatic mammals
All living animals have an internal clock, the circadian rhythm, which is close to 24 hours' duration. For humans, the average duration is 24 hours and 20 minutes, and individually some people have more or less than 24 hours. Everyday exposure to the morning light resets the circadian rhythm to 24 hours, so that there is no drifting. [27]
Sleep efficiency ( SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.
On average, university students get 6 to 6.9 hours of sleep every night. Based on the Treatment for Sleep Disorders, the recommended amount of sleep needed for college students is around 8 hours. According to Stanford University 's Department for the Diagnosis, 68% of college students aren't getting the sleep they need. [3]