Summary: People nowadays have the habit of staying up late to sleep, and pregnant women are no exception. Due to the influence of progesterone, as well as the effects of uterine enlargement and difficulty breathing, many pregnant mothers always have insomnia and go to bed late. Moreover, there are some pregnant mothers who could go to bed early, but have to stay up late, watch TV shows on their mobile phones, and stay up until midnight. People nowadays have the habit of staying up late to sleep, and pregnant women are no exception. Due to the influence of progesterone, as well as the effects of uterine enlargement and difficulty breathing, many pregnant mothers always have insomnia and go to bed late. Moreover, there are some pregnant mothers who could go to bed early, but do not