Sleep time should generally be kept at 7 to 8 hours, but it is not necessary to force it, but it varies from person to person. Those who fall asleep quickly and deeply generally have no dreams or fewer dreams, and they can fully recover their energy after sleeping for 6 hours; People who fall asleep slowly and shallowly, have a lot of sleep eyes and often have nightmares still don't feel refreshed even after sleeping for 10 hours. They should get effective sleep through various treatments, but prolonging sleep time is harmful to their health.
2. The sleep time of human beings at different ages is different. Babies sleep for 20-24 hours, children for 9- 12 hours, school-age children for 9- 10 hours, adults for 7-9 hours, the elderly for 6-8 hours, and the elderly over 80 years old for 9- 10 hours.