What impact does insomnia in pregnant women have on the fetus? Insomnia in pregnant women means that pregnant women have difficulty falling asleep at night or the quality of their sleep is not high. This situation is very common. However, frequent insomnia in pregnant women will have certain negative effects on the fetus. First of all, insomnia in pregnant women will affect the development of the fetus. Lack of sleep in pregnant women affects the secretion of estrogen, which ultimately leads to delayed growth and development of the fetus. Because lack of sleep can cause physical