Old insomnia in the first month of pregnancy may be caused by emotional tension, excessive stress, and too much sleep during the day. 1. Emotional tension: After pregnancy, due to the influence of hormones, there will be nausea, vomiting, fatigue and other early pregnancy reactions. As everyone reacts differently, some people may also experience emotional changes. Pregnant women who are overly nervous and worry too much about their pregnancy can lead to insomnia. 2. Excessive stress: Worries about the health of the fetus during pregnancy and the pressure of work and life may cause insomnia in pregnant women. 3. Excessive daytime sleep: If a pregnant woman sleeps too much during the day, she may have difficulty sleeping at night and suffer from insomnia. There are many possibilities for insomnia in the first month of pregnancy, which can be reduced by adjusting the mindset, sleeping less during the day, and communicating with family members to solve the problem. If the effect is not good, you still need to seek medical treatment in time, so as not to affect the development of the fetus.