Mid-pregnancy pregnant women sleeping position is preferred to the left side of the lying position, night can be alternated between left and right, the abdomen is not big can occasionally have supine position. Mid-pregnancy abdomen is not yet large when there can be occasional supine sleeping position, because supine position can aggravate the lumbosacral pain during pregnancy, it is preferred to the left side of the bed, the night can be alternated between left and right, to avoid prolonged retention of the same sleeping position caused by discomfort. In order to maintain the comfort of a pillow can be placed between the legs, knees bent forward at right angles, with the growing abdomen, you can put a pillow under the stomach to reduce the burden on the waist. No matter what stage of pregnancy should be avoided prone position, will compress the abdomen, before going to bed should avoid excessive drinking water, so as not to increase the number of urination at night, and try to wear loose comfortable pajamas, to ensure the quality of sleep at night.