During pregnancy, it is best to sleep on the left side, the main benefits are as follows: First, sleeping on the left side can reduce the pressure on the heart, which can increase blood flow and avoid various cardiovascular diseases. Second, in late pregnancy, pregnant women’s feet are more prone to swelling, the left side of the sleeping position can promote blood circulation, relieve swelling and other symptoms. Thirdly, the uterus is in a right-rotating state in late pregnancy, sleeping in the left side position can improve the degree of right rotation of the uterus and increase the blood flow of the uterus and placenta, which can better provide nutrients to the fetus and avoid oxygen deficiency. In the second half of pregnancy, you must pay attention to choosing a good posture, it is best not to keep a constant posture, and not to sit and stand for a long time, which may also affect the body’s blood circulation, resulting in various diseases.