Level 1: Causes and effects of insomnia in pregnant women. Insomnia is a very common phenomenon during pregnancy. The main reasons include hormonal changes, physical discomfort, mood swings, etc. Long-term insomnia can have adverse effects on the physical and mental health of pregnant women, such as anxiety, depression, headaches, gastrointestinal discomfort, etc. Level 2: Methods to improve sleep for pregnant women (1) Maintain a regular schedule and establish good sleep habits; (2) Pay attention to a healthy diet and avoid overeating or drinking.