The amount of sleep required by humans changes with age. In general, the younger you are, the longer you sleep and the more often you sleep. The fetus also has moments of sleep and wakefulness in the mother’s womb, although the vast majority of the time is spent in sleep; after birth, a newborn baby sleeps 22 hours a day; a 2-month-old baby needs 18-20 hours of sleep, including 4-5 times during the day, each time for about 2 hours; after 2 months, babies wake up less and less at night, and sleep less and less during the day; a 1-year-old toddler needs 15 The 1-year-old needs 15 hours of sleep, of which the daytime sleep is less and shorter, while the number of night wakings is extremely small, sometimes due to urination; 2-year-olds need about 14 hours of sleep, they sleep about 2 times during the day, each time about 2 hours; 3-4-year-olds need 12-13 hours of sleep; 5-7-year-olds need 10-12 hours of sleep, only 1 time during the day can be; 8-12-year-olds need 10 hours of sleep; 12-18-year-olds Adolescents generally need about 9 hours. Sleep is very important for the growth and development of their central nervous system. The average sleep time of adults is 7-8 hours. 60 years old and above should extend their sleep time accordingly. 60-70 years old should sleep about 9 hours a day; 70-90 years old should sleep about 10 hours a day; 90 years old and above should sleep 10-12 hours a day, not less than 10 hours. People always think that the elderly do not need a lot of sleep time, this view is not entirely correct, indeed, the elderly generally sleep only 5 to 6 hours at night, but the elderly often doze off light sleep during the day, they are exactly this way to supplement the lack of sleep at night. The fact that sleep duration is so closely related to age is due to the laws of human growth and development. Infants and children have not yet matured either in brain or body, and teenagers’ bodies are still continuing to develop, so they need more sleep time. Older people have less sleep because of the deficit of Qi and blood, Yin and Yang, and the deficit of Ying and blood and the attack of Wei Qi, but it is not the same as the physiological need for less sleep. On the contrary, because the elderly sleep depth becomes shallow, the quality is not good, but should increase the sleep time, which is particularly important to supplement the nap. In conclusion, sleep is absolutely necessary throughout a person’s life, from the time he or she is born to the time he or she is happy to return to the yin, but the time, structure and content of sleep vary considerably with age. The daily need for sleep varies from age to age and from person to person, but in general, the quality of sleep is more important for health than the quantity of sleep.