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Thirteen- to 18-year-olds need about eight to 10 hours of sleep per night, but the sleep schedule shifts, with bedtime coming later in the evening and wake-up coming later in the morning.
Sleep recommendations tend to vary by age and individual needs. Experts explain how much sleep the average adult needs and how to make sleep a priority.
Sleep is a highly conserved behavior across animal evolution, [6] likely going back hundreds of millions of years, [7] and originating as a means for the brain to cleanse itself of waste products. [8] In a major breakthrough, researchers have found that this cleansing may be a core purpose of sleep. [9]
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]
Sleep deprivation may represent a final common pathway in the genesis of mania, [152] and manic patients usually have a continuous reduced need for sleep. [153] The symptoms of sleep deprivation and those of schizophrenia are parallel, including those of positive and cognitive symptoms. [154]
We’ve all heard that adults should get a recommended eight hours of sleep, but how much sleep do we actually need?
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] Within the sleep of adults and infants there are cyclic fluctuations between quiet and active sleep.
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