Insomnia is the most common kind of sleep disorder, which is a subjective experience of unsatisfactory sleep quality, sleep time and sleep efficiency, mainly manifested as difficulty in falling asleep or sleeping continuously, etc. Pregnancy insomnia refers to the phenomenon of insomnia in which mothers-to-be cannot fall asleep peacefully as soon as possible during pregnancy, or wake up easily after sleeping, or cannot sleep again after waking up. Common causes are as follows: 1. Hormonal changes in the body: hormonal changes in the body after pregnancy, estrogen and progesterone level adjustment, resulting in emotional instability of pregnant women, tolerance to stress is lower than before, easy to appear depressed mood, resulting in insomnia; 2. Physiological changes: the possibility of pregnancy vomiting in early pregnancy, serious cases can also occur at night, resulting in physical discomfort; with the gradual extension of pregnancy, the pregnant woman’s uterus gradually increased. The symptoms of frequent urination appear, the number of night urination increases, which seriously affects the quality of sleep, and even cannot continue to sleep after waking up; 3, bad habits: pillow discomfort or incorrect sleeping position, cramps caused by calcium deficiency, drinking coffee, tea, beverages, too full or too hungry, too long bed time during the day and irregular rest and rest, playing cell phones before going to bed, etc.; 4, supine factor: pregnant women sleep in supine position for a long time, which can form over time Insomnia. When a pregnant woman lies on her back, the enlarged uterus compresses the inferior vena cava, which reduces the amount of return blood and decreases cardiac blood output. Some pregnant women can suddenly occur chest tightness and breath-holding, pale, cold sweat and other shock states, known as “supine hypotension syndrome”, when supine position leads to hypotension for too long, through the role of pressure sensing, causing sympathetic excitation, and release a large amount of adrenaline, resulting in a sharp rise in blood pressure, known as “supine hypertension syndrome”, whether it is hypotension or hypertension, will have a negative impact on the health of pregnant women. 5, cramps in the middle of the night: pregnant women to the late stage, often occur cramps and affect the quality of sleep, medical believe that cramps are mostly related to the sleeping position, usually easy to occur when the palms of the feet down. In addition, it may also be related to local blood circulation, blood pH. 6, family genetic factors: the incidence of insomnia in those with a family history of insomnia is three times higher than those without a family history, and some pregnant women already have insomnia symptoms before pregnancy; 7, stress and life events: changes in the sleep environment or certain unexpected events lead to mood swings, or have not yet adapted to the life of pregnant women. Therefore, insomnia is the end result of a variety of complex factors, including changes in physiological, psychological, environmental and other factors. Long-term insomnia will affect the normal growth of pregnant women and fetus, and should be adjusted early.