I often hear old people say that they are old and sleep less and less at night. The study found that 70-year-olds wake up at night 6.5 times as often as 20-year-olds. Physiology believes that the sleep quality of the elderly has a great relationship with their physical and mental health. Because sleep helps to reduce the consumption of brain cells, eliminate self-fatigue, enhance the body's immune function, balance and regulate the central nervous system, delay the aging of various organs, promote the body's metabolic activities, and regulate the balance between exercise and rest, tension and relaxation, and work and rest. Therefore, the sleep time of the elderly should be properly arranged according to their physiological characteristics, physical condition and age differences. According to physiological research, under normal circumstances, people aged 60-70 sleep for no less than 9- 10 hour, people aged 70-80 sleep for no less than10-1hour, and people aged 80-90 sleep for1hour. If you don't get enough sleep for one day and one night, you should take a nap the next day to meet the basic physiological needs of the elderly. Old people should not fall asleep because they love to sleep.