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"Optimal sleep is important because getting the right number of hours of sleep ensures good sleep architecture and healthy patterns for staying and falling asleep," says Dr. Alex Dimitriu, MD, a ...
Healthy adults need to sleep at least seven hours a night on a regular basis for optimal health, according to the American Academy of Sleep Medicine. So for most people, eight hours is enough. So ...
During the recommended seven to nine hours of sleep, we typically go through three to five sleep cycles per night, with the duration of REM sleep getting longer each subsequent time, Varga explains.
Other researchers have questioned these claims. A 2004 editorial in the journal Sleep stated that, according to the available data, the average number of hours of sleep in a 24-hour period has not changed significantly in recent decades among adults. Furthermore, the editorial suggests that there is a range of normal sleep time required by ...
Children need many hours of sleep per day in order to develop and function properly: up to 18 hours for newborn babies, with a declining rate as a child ages. [65] Early in 2015, after a two-year study, [91] the National Sleep Foundation in the US announced newly revised recommendations as shown in the table below.
In another study that followed about 70.000 women for 16 years, there was a significant increase in body weight in those who slept 5 hours or less compared to those who slept 7–8 hours. [1] [2] [8] As sleep time decreased over time from the 1950s to 2000s from about 8.5 hours to 6.5 hours, there has been an increase in the prevalence of ...
In a joint consensus published by the American Academy of Sleep Medicine and the Sleep Research Society, experts recommend seven hours — not eight — as the "magic number" for most healthy adults.
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 ]
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