The reason for not being able to sleep at night during the fifth month of pregnancy is a sleep disorder, and there are several reasons for this: First, it is related to the psychological factors of the patient, for example, when the patient is pregnant, the patient is under great psychological pressure or the family relationship is not harmonious, and the patient is worried and anxious, which can easily lead to sleeplessness. Second, the physiological factors caused by the five months of pregnancy, the uterus will continue to increase, up will be on top of the patient’s diaphragm, lungs, resulting in the patient’s breathing difficulties at night. When the uterus enlarges, it will compress the bladder downward, and the reduced bladder capacity will easily lead to excessive nighttime urination, and the sleep will be constantly interrupted, causing the patient’s plant nerve dysfunction, which will also cause the problem of sleeplessness. Third, related to the change of the patient’s sleep rhythm, when pregnant some women may not have a fixed biological clock, sleep time one day early and one day late also easily cause biological clock disorders, resulting in patients have difficulty sleeping.