5 months of pregnancy can not sleep flat, it is generally recommended that as long as you are pregnant, are sleeping on your side, whether it is the left side, or the right side. Because with the expansion of the uterus, that is, the growth and development of the fetus, the burden of the abdomen will be heavy, lying flat will compress the blood flow of pregnant women, that is, venous reflux, for a long time is not possible, the pregnancy week is not possible. In fact, with the increase in pregnancy week, pregnant women can not do lying down in this position, lying down for a while will be uncomfortable, so it is recommended that as long as the pregnancy, you must lie on your side, whether it is the left side, the right side can be. Because this supine will be out of danger, sometimes pregnant women’s arteriovenous return obstruction will be uncomfortable, and will also affect the placenta blood supply. So five months of pregnancy must sleep on the side, not flat, flat sleep will be dangerous, both for the fetus, or for the pregnant woman herself, there is the possibility of danger.