Sleep time at different ages:
Adequate sleep is the guarantee of health and longevity, and the best sleep time should be determined according to different age, gender, physique, personality and environmental factors. As we all know, the younger you are, the longer and more times you need to sleep, which is determined by the law of human growth and development. Infants and young children are in the most vigorous growth period and must have enough sleep; Teenagers are developing physically and have to undertake heavy learning tasks, so they also need more sleep time; Some people think that the elderly can sleep less. On the contrary, the elderly need more sleep time than the young. Because the elderly are deficient in both qi and blood, "healthy qi declines less, and defensive qi erodes internally", there is a phenomenon of "not being refined in the day and not being spoiled at night", that is to say, they have no spirit during the day and can't sleep at night, but this does not mean that the physiological sleep time needs to be reduced. On the contrary, because the elderly have poor sleep quality and are easy to wake up, it is necessary to appropriately increase sleep time, especially nap. Ancient health care experts said: "Lack of sleep is a big problem for the elderly." "Ancient and Modern Yan Jia" also believes that the elderly should "take a pillow when sleeping."
Sleep time is more or less related to gender. Generally, women sleep longer than men on average. Modern research suggests that it may be related to the difference of sex hormone secretion. Generally speaking, the best sleep time for infants is 14 ~ 15 hours, for preschool children, 12 hours, for pupils, 9 hours for middle school students, 8 hours for college students, 8 hours for adults and 9 ~ 10 hours for the elderly.