When a pregnant woman sleeps, the fetus may be sleeping or awake, so the fetus may move when the pregnant woman is asleep. A healthy fetus has a large amount of activity every day, and generally pregnant women and fetuses do not have exactly the same work and rest. It is normal for a pregnant woman to fall asleep while the fetus may be moving in her belly, such as kicking its hands and feet, turning over, urinating, swallowing amniotic fluid, playing with the umbilical cord, sucking its fingers, etc. Many pregnant women are also woken up by fetal movements when they are asleep, which means that the fetus is not sleeping at this time. The fetus spends about 90% of its time resting, so if the fetus does not move while the pregnant woman is asleep, this is generally normal. In the early stages of pregnancy, the fetus is small and the amniotic fluid is sufficient, so it is not easy to touch the wall of the uterus, so the fetal movement is not obvious at this time. In the middle and late pregnancy, the month increases, the size of the fetus gradually increases, the space available for movement in the uterine cavity becomes smaller, the range of activity is limited, if the movement is relatively large, the pregnant woman can feel the obvious fetal movement, may also affect the pregnant woman’s sleep.