Usually patients with coughs have worse symptoms at night, and a cough that stays bad may be related to cough variant asthma, bronchiectasis, cardiac insufficiency, and other causes. 1. Coughing at night: coughing at night is generally due to increased parasympathetic excitability at night or early morning, bronchial smooth muscle contraction than the daytime seriousness, respiratory secretions will also increase accordingly, position changes or airway secretions, etc. can be stimulated by the airway aggravation of coughing symptoms. 2. Cough variant asthma: cough variant asthma belongs to a type of asthma, more chronic cough, especially at night irritating cough obvious. 3. Bronchial dilatation: respiratory tract infections and other reasons for recurrent suppurative inflammation of the bronchial tubes, resulting in bronchial dilatation, the patient has a long-term recurrent symptoms such as coughing, coughing up sputum, hemoptysis or fever. 4. Cardiac insufficiency: lying down at night will increase the burden on the right heart, which will cause stasis in the lungs and impede the lung function, thus worsening the cough at night. Cough has been bad, especially at night cough can also be related to other diseases, it is recommended to go to the hospital in time, after a clear diagnosis of standardized treatment as prescribed by the doctor.