Occasionally stay up late during pregnancy does not matter, do not have to be particularly nervous, pay attention to rest and regulation can be; but it is not recommended to stay up late for a long period of time, long-term stay up late rest is not enough, may cause anxiety and other diseases. Occasionally stay up late on the health level of pregnant women and the fetus is not obvious, do not have to be particularly anxious, it is recommended to pay attention to rest after staying up late, if the strain and fatigue is obvious, it is recommended to take a rest in a timely manner. Prolonged late night or or irregular sleep may cause anxiety, endocrine hormone secretion level abnormalities and other injuries, if the work and other reasons lead to a certain degree of sleep deprivation, may cause mothers to stress during pregnancy, thereby increasing the risk of the occurrence of gestational hypertensive disorders, gestational diabetes mellitus. The fertilization of the egg in early pregnancy is not very stable, and prolonged fatigue, exertion, and sleep deprivation may lead to miscarriage or obvious early pregnancy reactions and other hazards. Women during pregnancy are advised to have a regular routine and rest, especially in the early stages of pregnancy. When severe early pregnancy reaction occurs, it is recommended to seek prompt medical attention.