During pregnancy, you can sleep on the left side or the right side, either on the left side or the right side in early pregnancy, and the left side will be better in the middle and late stages of pregnancy. Early pregnancy embryo development is relatively small, the uterus has not protruded from the pelvis, there is no high demand for sleeping position, you can choose to sleep on the left side of the bed or the right side of the bed, will not have an impact on the growth and development of the fetus. The uterus gradually increases after the middle and late stages of pregnancy, slowly will be a right-handed state, try to choose the left side of the position to sleep, can improve the uterus right-handed, can also reduce the pressure on the inferior vena cava, to provide the placenta with more adequate blood oxygen, but not a long time of the left side of the position, the left side of the position of the position of the left side of the position of the right side of the position of the position of the replacement of the right side of the position of the tired. Sleeping position during pregnancy should also be comfortable to personal feeling appropriate, some women sleep in the left lateral position feel chest tightness, breathing difficulties, frequent fetal movement, there is no mandatory requirement must be left lateral position, can be changed to the right lateral position. During pregnancy to pay more attention to rest, try to avoid too much physical exertion.