Children and adolescents in the growth and development stage usually need at least 9 hours of sleep every day. They should follow the principle of going to bed early and getting up early to ensure deep sleep around 3 pm.

2. Middle-aged people: about 7-8 hours a day.

Adult men need an average of 6.49 hours of sleep, and women need about 7.5 hours, which is 7-8 hours.

3.60 years old or older: 5.5~7 hours a day.

Compared with the elderly who sleep for more than 9 hours and less than 5 hours a day, sleeping for 7 hours a day is the most ideal. Old people usually go to bed before 12 o'clock and wake up naturally around dawn.

Extended data The mortality rate of men who sleep less than 7 hours is 26% higher than that of men who sleep 7-8 hours, and that of women is 2 1%. The mortality rate of men who sleep for more than 8 hours is 24% higher than that of men who sleep for 7-8 hours, and that of women is 17%.

Too much or too little sleep in the elderly may lead to cognitive decline and premature onset of Alzheimer's disease.

People's Network-How long do you sleep every day?