Pregnant women who sleep more will not have any effect on the fetus, occasionally sleep less will not have any effect, long-term sleep less may have an effect on the fetus, increase the chances of miscarriage, preterm delivery, difficult labor, developmental delay. Pregnant women sleep more, may be pregnant body hormone levels change sharply, the body’s metabolism accelerated, the calorie consumption increases, the body appeared sleepy response, sleep more will not have an impact on the fetus. There is no abnormal situation, usually should be appropriate out of bed activities, do not long time bedridden on the good. Pregnant women with little sleep for a long time will make the nervous system in a state of excessive tension for a long time, the whole person will be overly anxious, irritable, the body’s system function regulation has a greater impact, the body’s hormone level disorders may increase the chances of miscarriage of the fetus, the fetus in the middle and late stages of pregnancy may be preterm delivery. Pregnant women with little sleep for a long time will also affect the normal development of the fetus, resulting in fetal growth retardation, low birth weight and other phenomena. Pregnant women should develop good sleeping habits and get enough sleep every day.