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　　In spring, people often feel sleepy and unable to lift their spirits. This is commonly known as "spring sleepiness". Every spring, people in the office often feel drowsy. Once someone starts yawning, it's like a "contagion" and everyone in the office will start yawning all day long. This is because, in the cold winter, the human body skin It is relatively cold, so the blood vessels in the limbs and body surface contract, and the blood flow decreases. When the whole body blood flow is quantitative, the blood flowing through the brain increases relatively. In spring, the weather gets warmer, the skin temperature rises, the blood vessels on the body surface and limbs expand, and the blood in the internal organs is diverted to the capillaries on the body surface. The blood flow in the brain tissue is naturally reduced accordingly. The brain is prone to insufficient blood supply, and the oxygen supply to the brain tissue is relatively insufficient, affecting the excitement of the brain, and spring sleepiness appears.

Spring sleep principle "sleep at night and get up early”
　　
Normal sleep in spring should be "sleep at night and get up early". The day's plan begins in the morning. As early as in the "Huangdi Neijing", there is an incisive conclusion, "Lie down at night and get up early, walk widely in the courtyard, and walk slowly with fur, so that your ambition can be established." That is to say, people should adapt to the changes in nature, go to bed late and get up early, go for a walk outdoors, stretch their limbs leisurely and contentedly, and focus their spiritual activities on nature. Taking a leisurely stroll in the garden after meals and before going to bed not only helps digestion and dissipate qi, but also relieves thoughts and worries, allowing the mind and body to rest and feel refreshed. But at the same time, it should be noted that in spring, especially in early spring, when the weather is warm and cold, you need to add or remove clothes according to the weather to prevent the occurrence of spring temperature and block influenza, acute and chronic bronchitis, pneumonia, etc., so appropriate "spring covering" is also necessary. When sleeping in spring, it is advisable to "go to bed on time and not wait until it is too late" ； A quarter of an hour nap at noon can make up for an hour at night ； The body and brain are used together, the form and spirit are combined, and the spirit is governed."