If you experience vomiting at night during the first trimester, it is caused by pregnancy reaction. In the first trimester, nausea and vomiting, loss of appetite, drowsiness, and weakness are all physiological manifestations due to the influence of hormones in the body. This condition should begin to appear from about 40 days of pregnancy and continue until the third trimester, but not all pregnant women will have this symptom, it may be related to the individual’s constitution and endocrine, some people will appear only in about two months, and some people have stopped in about two months. Physiological vomiting generally does not require special treatment, during this period try to eat a light diet, do not eat too greasy food and spicy stimulating food can be.