Difficulty in sleeping and breathing in late pregnancy may be caused by the enlarged uterus, increased blood volume in late pregnancy and excessive weight gain, etc. Symptoms can be relieved by oxygen intake, sleeping on the left side and weight control. 1. Enlarged uterus: As the diaphragm rises after the uterus enlarges, it presses on the chest cavity and restricts breathing, and the displacement of the heart may also lead to dyspnea. Pregnant women can relieve the symptoms of dyspnea by inhaling oxygen and changing sleeping position. 2. Increased blood volume in late pregnancy: blood volume increases in pregnant women throughout pregnancy, and the speed of blood flow increases, the heart also increases slightly, and the heart rate increases, which can lead to slight dyspnea in some people. Pregnant women can alleviate the symptoms by reducing exercise and sleeping on the left side. 3. Excessive weight gain: usually the most appropriate weight gain throughout pregnancy is 12 to 15 kilograms, when the weight gain is too much will increase the burden on the pregnant woman’s heart, causing pressure on the spine, the pressure of the blood circulation increases, resulting in pregnant women with dyspnea. Pregnant women can control their weight by reducing sugar intake and exercising appropriately to alleviate the symptoms. If a pregnant woman in the late stages of pregnancy symptoms of sleep dyspnea, through the above methods, the symptoms still can not be relieved, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, to clarify the cause of the disease, and timely treatment.