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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.
The National Sleep Foundation recommends that adults aim for 7–9 hours of sleep per night, while children and teenagers require even more. For healthy individuals with normal sleep, the appropriate sleep duration for school-aged children is between 9 and 11 hours.
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.
Hours of sleep recommended for each age group [91] Age and condition Sleep needs Newborns (0–3 months) 14 to 17 hours Infants (4–11 months) 12 to 15 hours Toddlers (1–2 years) 11 to 14 hours Preschoolers (3–4 years) 10 to 13 hours School-age children (5–12 years) 9 to 11 hours Teenagers (13–17 years) 8 to 10 hours
Most adults who sleep the recommended seven to nine hours a night get about one to two hours of deep sleep. ... Most people get around 1.5 to two hours of slow-wave sleep if they get eight hours ...
Teenagers (13 to 18 years) should sleep 8 to 10 hours per 24 hours Adults should sleep 7 or more hours per night The eight-hours-a-night rule for adults is a bit of a myth, says Harris.
A normal healthy adult requires 7–9 hours of sleep per night. The number of hours of sleep is variable, however the proportion of sleep spent in a particular stage remains mostly consistent; healthy adults normally spend 20–25% of their sleep in REM sleep. [ 5 ]
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