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Polyphasic sleep. 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]
Microsleep. A microsleep is a sudden temporary episode of sleep or drowsiness which may last for a few seconds where an individual fails to respond to some arbitrary sensory input and becomes unconscious. [1] [2] Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without ...
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 researchers also analyzed differences in sleep duration of over and under 60 minutes and found a 34% increased risk for those who had a difference of over 60 minutes, but this decreased to 11% ...
A power nap, also known as a Stage 2 nap, is a short slumber of 20 minutes or less which terminates before the occurrence of deep slow-wave sleep, intended to quickly revitalize the napper. The expression "power nap" was coined by Cornell University social psychologist James Maas. [ 2] The 20-minute nap increases alertness and motor skills. [ 2]
By this measure, the U.S. is in a pretty good spot with regular Americans comprising 64% of all American charitable donations in 2022, according to an analysis by the United Nations.
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