The more obvious coughing symptoms of pregnant women lying down at night may be due to dry and turbid air or respiratory diseases that stimulate the respiratory tract, and the coughing intensifies after lying down due to the squeezing of the lungs, which can be targeted after identifying the causes. Common causes and treatment methods 1. Physiological factors: including dry, turbid indoor air and improper sleeping posture. If the indoor air is dry and turbid, it is easy to stimulate the respiratory tract of pregnant women, leading to severe coughing at night. Proper ventilation is needed indoors to improve air quality. 2. Respiratory diseases: Inflammatory diseases or colds in the trachea, bronchus and throat, for example, can cause the vagus nerve around the lungs to become more excited at night, resulting in increased secretions from the trachea and bronchus, increasing stimulation and the symptoms of a relatively heavy cough at night. Medication can be taken under the guidance of a professional doctor. Pregnant women, due to the special nature of their bodies, can change to a left-sided sleeping position to avoid pressure on the lungs if they have obvious coughing symptoms when lying down at night; at the same time, they can keep their mood happy, avoid emotional excitement, take as little medication as possible, and can be relieved by adjusting their diet and improving their immune system, eating more light, nutritious fruits and vegetables, and doing appropriate exercise, such as yoga for pregnant women.