Vomiting at night during pregnancy is related to hormone level changes, diet, mental tension and other factors, as follows: 1, hormone level changes: the level of human chorionic gonadotropin in the body of pregnant women at night rises, the rise is more obvious than during the day, under the influence of hormone level maternal nausea and vomiting symptoms are likely to occur. Pregnant women can take vitamin B1, B2, B6 and vitamin C for improvement under the guidance of doctors, especially vitamin B6, which is commonly used to treat early pregnancy reaction of pregnancy vomiting; 2. Diet: pregnant women may cause vomiting if they eat too much or eat too greasy at night. In this case, pregnant women should pay attention to a reasonable diet, mainly light, easy to digest diet, less time and more meals, dinner should not be too full, appropriate exercise after meals, avoid eating too greasy or spicy food; 3, mental tension: pregnant women may not be very serious pregnancy vomiting during the day at work or have other things to distract them, but at night when resting, it is easy to cause mental tension caused by pregnancy vomiting. Should relax, do not pay too much attention to worry, you can listen to music to sleep appropriately.