Pregnant women who do not sleep well for a short period of time will not have any obvious effect on the fetus, but if they often do not sleep well it will affect the development of the fetus, and may also lead to problems such as lack of oxygen in the fetus. If a pregnant woman has poor sleep once or twice in a while, it will not have a greater impact on the fetus. However, if the quality of sleep is poor for a long time, such as long-term insomnia, easy to wake up at night, etc., it will affect the development of the fetus. Because after a pregnant woman sleeps poorly, it will affect the hormone levels in the pregnant woman’s body. Large fluctuations in hormones may have an effect on the growth and development of the fetus. If a pregnant woman often sleeps poorly, it will affect the supply of oxygen and nutrients to the placenta to a certain extent, and the fetus may suffer from intrauterine hypoxia. If the fetus is deprived of oxygen for a long time, it will also adversely affect the brain development of the fetus. If pregnant women often have poor sleep, they need to actively cooperate with the doctor’s examination and treatment in order to improve the quality of sleep. At the same time, they should also actively adjust their mindset and ensure a regular routine.