For normal people, in the absence of disease restrictions, the flat position, side lying position are the correct sleeping position. And the human body in a mature sleep state, generally rarely keep the same sleeping position, will be according to their own comfort needs, and constantly adjust the appropriate sleeping position. 1, flat position: this sleeping position can be the body’s weight dispersed to the back, will not compress the internal organs, the body is more evenly stressed, conducive to blood circulation, can effectively relieve the neck, back pain, but also conducive to food in the gastrointestinal tract It is also conducive to the transportation and digestion of food in the gastrointestinal tract. However, it is not recommended for people who snore to sleep in a flat position for a long time, because in a mature sleep state, it is easy to have a backward fall of the tongue causing apnea; 2, side lying position: side lying position with legs bent and body flexed, the whole body is relaxed, which is conducive to relieving fatigue and is a more comfortable sleeping position. Usually the right lateral position is healthier and does not compress the heart, reducing the burden on the heart. For obese people, especially centrally obese people, not suitable for lying down, you can choose the side lying position, which is conducive to sleep to keep breathing smoothly. In addition, the left lateral position of pregnant women in late pregnancy is conducive to relieving the compression of the abdomen on the lumbar spine and improving comfort, while reducing the compression of the uterus on the arteries, which is conducive to the blood supply of the placenta. Sleeping on the baby’s side can also prevent vomiting and regurgitation of stomach contents.