Sleeping cough at night is related to daily habits, but also may be due to night vagus nerve excitation and disease factors and some other reasons. 1. Behavioral habits: smoking before bedtime and eating spicy and stimulating food for dinner will stimulate the airways when breathing, which will easily lead to the manifestation of bedtime cough. 2. Vagal excitation: Vagal excitation causes secretion of respiratory glands and contraction of bronchial smooth muscle. At night, the vagus nerve is relatively active, and the body is prone to coughing. 3. Disease factors: gastroesophageal reflux disease patients, lying down at night, gastric acid reflux to the throat, stimulate the throat, thus producing dry cough symptoms. Heart failure patients with pulmonary circulation stagnation and edema, lying down at night will also appear cough symptoms. 4. Other reasons: sleeping due to space closure, dirty air will also stimulate the respiratory tract, easy to cough. Various factors that cause coughing at night, do dinner light diet, keep the air fresh, you can reduce the stimulus of coughing. For patients with related diseases causing obvious symptoms, they should seek medical attention as soon as possible.