Five months pregnant sleeping is recommended to lie on the left side, the left side of the lying position can reduce uterine compression, improve fetal oxygen supply, relieve the lower limbs of pregnant women edema, is conducive to the development of the fetus. There are the following benefits: 1, reduce uterine compression: five months pregnant women lying on their backs, the enlarged uterus will compress the inferior vena cava and the abdominal aorta, supine hypotension syndrome, using the left side of the lying position can reduce the compression, alleviate the discomfort caused by the uterine compression; 2, improve the state of the fetus oxygen: five months pregnant, the uterus is more right rotational, the uterus of the blood comes from the uterine artery. Pregnant women take the left side lying position, can make the right rotation of the uterus to the left shift, reduce uterine vascular tension, increase placental blood flow, improve the state of fetal oxygen supply in the uterus, is conducive to the growth and development of the fetus, to reduce the birth of low-birth-weight babies and reduce the mortality rate of perinatal infants have important significance; 3, alleviate the lower limb edema pregnant women: the left side of the bed can reduce the uterus on the inferior vena cava compression, increase the return of cardiovascular blood flow, the lower limb Venous reflux is smooth, so that the lower extremity edema is relieved. Sleeping five months pregnant is recommended to lie on the left side, but pregnant women lying on the left side of the whole night may be fatigue, you can change the position appropriately to relieve fatigue.