Pregnant women sweat at night due to the increase of estrogen secretion in the body during pregnancy and the increase of cortisol-binding globulin concentration in the blood, resulting in a prolonged hyperactive state of adrenal cortex function, plus the basal metabolic rate of women during pregnancy is much higher than usual. It is recommended that in addition to the appropriate thickness of the blanket, sweating due to calcium deficiency should also be excluded. It is recommended to start taking calcium supplements after mid-pregnancy, to get more sunlight and drink more milk to help the absorption of calcium and relieve the sweating at night. It is also recommended to change underwear in time after sweating to avoid catching a cold that can cause upper respiratory tract infections, and to eat more calcium-containing foods in your diet, such as drinking more milk, one glass a day.