Many old people like to "go to bed early and get up early", which is actually unscientific. Zhu Xinyi, director of the Health Management Center of Zhong Da Hospital affiliated to Southeast University, explained that we'd better adjust our work and rest according to the seasonal laws. Simply put, it is to follow the time of sunrise and sunset. In spring, everything revives and the spirit of the sun begins to grow. Everyone should get up early even if he feels sleepy. In summer, the sun is strong, so you can sleep late, but you must get up early in the morning. Go to bed early in autumn, but get up early in the morning and go to bed early and get up late in winter, especially for the elderly. In addition, in winter, when the sun is weak, it is generally not recommended to get up early for outdoor morning exercises. Besides, don't get up immediately after waking up. It's best to lie in bed for a while to stretch your limbs and joints. After getting up, you can also twist your neck, stretch and do some warm-up exercises.