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睡眠需要量因年龄而异,出生及幼年时最多,老年时减少。成年人夜间睡眠约为7～8小时,但个体差异很大,有人短于6小时,或长于9小时。就每个人而言,虽然各有其比较固定的睡眠模式,但有时也会多睡一些或少睡一些。为什么有睡眠需要量的差别?影响睡眠需要量的是些什么因素?国外近二十年来有不少研究,介绍于下:
The amount of sleep varies according to age, most at birth and in young age, and decreases in old age. Nighttime sleep is about 7 to 8 hours for adults, but individuals vary widely, with people shorter than 6 hours or longer than 9 hours. For everyone, although each has its own relatively regular pattern of sleep, it sometimes takes more or less to sleep. Why there is a difference between the amount of sleep needs? What are the factors that affect the amount of sleep required? Nearly 20 years abroad, there are many studies, introduced in the next: