Dry cough at night is often seen in cough variant asthma, cardiac insufficiency, gastroesophageal reflux and so on. 1. Cough variant asthma: mostly at night or in the early morning, the increase of vagal excitability at night, leading to a significant increase in airway sensitivity, and cough at night, need to improve the chest CT, bronchodilatation test or exhalation of nitric oxide measurement and other definitive diagnosis. 2. Cardiac insufficiency: coronary artery disease, wind heart disease and other causes of cardiac insufficiency, sleep at night in the lying position when the increase in the volume of return blood, the degree of pulmonary stasis increased induced by the degree of patients coughing, accompanied by tightness in the chest, sitting breathing, coughing up pink foamy sputum, sweating and other symptoms. 3. Gastroesophageal reflux-related cough: stomach acid reflux to the pharynx stimulates the trachea at night when you sleep in the prone position to induce an irritating cough, which can be accompanied by acid reflux, heartburn, uh-oh and so on. In short, if you have a cough at night and take cough suppressant drugs are not effective, you need to consult a doctor in a timely manner, improve the relevant examination to clarify the cause of the disease, under the guidance of respiratory specialists to treat the cause.