Sleep on your back, usually with your body flat and straight, your arms flat on your sides, and don't cover your chest and abdomen too thick, so that you can breathe naturally, relax your muscles and get a full rest. If the weather is cold in winter, the quilt is thick and heavy, which is not conducive to sleeping on your back, or if you put your hands on your chest and abdomen, it will oppress your chest and abdomen and affect your blood circulation, so you can't sleep deeply and often have nightmares.
Sleeping on your stomach is a bad posture. Because the chest and abdomen are squeezed when sleeping, the expansion of the chest wall is limited when inhaling, breathing is laborious, and the body cannot rest; Furthermore, when sleeping, the head must be tilted to one side and the neck muscles are in a state of tension. As time goes on, the muscles of the neck and shoulders often feel pain and discomfort.
Curling is not a good sleeping position. This posture is more common in winter. Because the legs that are afraid of cold are straight and easy to catch cold, the legs are bent in the abdomen, and the body is bent like shrimp, which slows down the blood circulation of the lower limbs and makes it difficult to sleep. In the morning, they feel weak in their legs and feet.
Sleeping on your side is a healthy sleeping position. When sleeping on your side, don't put your arms under your head, bend your legs, and don't close them together, so that your whole body will relax, your blood circulation will be smooth, you will fall asleep quickly and deeply, and fatigue will easily recover, even if the quilt is thick. Physiologically speaking, the correct sleeping position is the best, because the correct sleeping position does not oppress the heart, but is beneficial to the blood return of the liver and the emptying of the stomach and duodenum. When the body enters a state of rest and sleep, the blood required by various organs of the whole body is reduced, and part of the blood flows to the liver, so that the heart load is reduced and the heartbeat and breathing are slowed down, which is in line with the normal physiological function of the human body and the theory that "the liver stores blood, and people lie down and return to the liver" discussed in the Internal Classic of Traditional Chinese Medicine.