Pregnant women often have nightmares because pregnant women are prone to fatigue as the months gradually increase, a little activity is prone to overwork, the burden on the organs of pregnant women gradually increase pressure on the abdomen of the uterus, which leads to excessive mental tension during the day. In addition, the usual poor sleep posture, overeating at dinner, eating too much too greasy, watching too excited horror TV can cause nightmares. During pregnancy, pregnant women are under a lot of psychological pressure, especially because the development and health of the baby are unknown, and excessive mental tension can also cause frequent nightmares. During pregnancy hormone levels change greatly, thus affecting the mood of pregnant women in their sleep, so pregnant women must pay attention to the rationalization of the nutritional diet, pay attention to the combination of work and rest, appropriate outdoor activities to breathe more fresh air, late pregnancy can breathe oxygen on time.