In the third trimester, the change in hormone level causes a serious early pregnancy reaction, which may cause sleeplessness. In addition, after the third trimester, the change in body condition may cause discomfort and sleeplessness due to the change in sleeping position. There are also psychological changes in the third trimester, and you may be worried or upset, making it difficult to sleep at night. Through the mental and hormonal changes, it causes sleeplessness at night. It is recommended that you can usually drink a glass of pure milk before going to bed, because pure milk has a calming effect and helps to help the quality of sleep in pregnancy. You need to pay attention to the need to supplement vitamins and calcium tablets during pregnancy, try not to stay up late and keep the air fresh.