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In reality, many people sleep less than eight hours a night, and some sleep more. So do you actually need eight hours of shuteye every night? We spoke to experts about how much sleep people need ...
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. [67] Early in 2015, after a two-year study, [ 93 ] the National Sleep Foundation in the US announced newly revised recommendations as shown in the table below.
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.
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 obesity from about 10% to about 23%. [2] Weight gain itself may also lead to a lack of sleep as obesity can negatively affect quality of sleep, as well as increase risk of sleeping disorders such as sleep ...
Experts discuss how much sleep people need, the health consequences of sleep deprivation, and how to sleep more. Is 7 hours of sleep a night enough? Sleep doctors weigh in
Why We Sleep: The New Science of Sleep and Dreams (or simply known as Why We Sleep) is a 2017 popular science book about sleep written by Matthew Walker, an English scientist and the director of the Center for Human Sleep Science at the University of California, Berkeley, who specializes in neuroscience and psychology.
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.
Within a few months of postnatal development, there is a marked reduction in percentage of hours spent in REM sleep. By the time the child becomes an adult, he spends about 6–7 hours in NREM sleep and only about an hour in REM sleep. [46] [47] This is true not only of humans, but of many animals dependent on their parents for food. [48]