Pregnant women sleeping late can have certain effects on the fetus: first of all, it may affect the growth and development of the fetus, because sleeping late during pregnancy may lead to endocrine disorders in pregnant mothers, affecting the development of the fetus, especially in the first few months of pregnancy, lack of sleep will affect the weight of the fetus, making the fetus light weight or other abnormal symptoms. Secondly, the late sleep of pregnant women will also make the baby born with deficient Qi and blood, if often sleep late, it is easy to cause insufficient blood production, affecting the fetus, making it born with insufficient blood. Again pregnant women stay up late baby grows slower, affecting the metabolism, affecting the fetus on the absorption of nutrients, may also grow slower after birth. So pregnant women must go to bed early during pregnancy, not stay up late, try to develop good habits before going to bed, appropriate foot bath, do not play cell phones, watch TV, you can also have a bedtime massage.