Sleepiness and drowsiness in pregnancy are mostly related to changes in hormone levels during pregnancy, accelerated metabolism, increased energy consumption, lack of sleep, and mental factors of pregnancy. 1. Changes in hormone levels during pregnancy: The pregnant woman’s body will secrete a large amount of progesterone during pregnancy. Progesterone will make pregnant women feel tired, which will lead to drowsiness, generally more pronounced in the first three months of early pregnancy drowsiness performance. 2. Increased energy consumption: increased consumption after pregnancy, increased cardiac output, adequate cerebral blood supply, easy to cause pregnant women to sleepy. 3. Accelerated metabolism: pregnant women have a high basal metabolic rate and consume a lot of calories, which may cause sleepiness and drowsiness. 4. Mental factors of pregnant women: If pregnant women are more worried about the health of the fetus or because of other things in life and work, psychological anxiety, it is easy to feel tired, sleepy and drowsy. 5. Lack of sleep: with the increase of pregnancy, the fetus gradually becomes bigger in the abdomen, and the fetal movement will become more and more obvious, which may cause pregnant women to have difficulty in falling asleep at night, resulting in drowsiness during the day. Therefore, when sleepiness and drowsiness occur in pregnancy, do not worry too much, this is a normal phenomenon after pregnancy, you should maintain a good mood, do not be overly anxious.