The sleeping position in the seventh month of pregnancy is generally recommended to lie on the left side. The reason why the left-sided position is recommended is that the uterus as a whole is right-sided after pregnancy, which will compress the inferior vena cava on the right side and cause obstruction of reflux. Therefore, when lying down or lying on the right side, there may be symptoms of chest tightness, nausea, vomiting and low blood pressure, and according to this physiological characteristic, it is recommended that pregnant women lie on the left side to properly correct the compression effect of the right-rotated uterus on blood vessels. However, long time left side lying is also uncomfortable, so according to the patient’s self-perception, she can sleep in left side lying position or right side lying position to her comfort, and pay more attention to the baby’s fetal movement, which position is fine if the fetal movement is very good. However, once dizziness and nausea occur, sleeping in the flat position is not recommended.