Pregnant women may experience rightward rotation of the uterus in late pregnancy, sleeping on the left side may alleviate rightward rotation of the uterus, but it is not necessary to sleep on the left side, but it is generally not recommended to sleep on the back. In late pregnancy, some pregnant women may have mild uterine rotation, which leads to compression of the inferior vena cava, may affect the blood flow of the umbilical artery, so it is recommended that the left side of the bed, but if the right side of the bed does not appear to be physically uncomfortable, can also be the right side of the bed, and change the sleeping position during pregnancy, but also to promote the activities of the fetus, to promote its growth and development. In general, there is no special requirements for the sleeping position during pregnancy, as long as the pregnant woman is comfortable, no discomfort, you can take any position to sleep, there is no obvious impact, so pregnant women can sleep on the right side.