Children do not cough during the day cough at night, may be caused by physiological factors, may also be caused by respiratory tract pathology, such as cough variant asthma; cardiovascular disease, such as congenital heart disease. 1. Physiological factors: due to the lower temperature at night, and the windows and doors will be closed at night, the air does not circulate, dry may cause coughing, in addition, bedding is not replaced in a timely manner to clean up, inhalation of similar dust mites, dust and animal dander and so on may also appear at night coughing. 2. Respiratory diseases: when the patient suffers from respiratory diseases, such as cough variant asthma, bronchitis, pharyngolaryngitis and other diseases, may cause daytime cough, cough at night. 3. Heart disease: common heart diseases such as congenital heart disease, due to the reduced pumping function of the child’s heart, in the night sleep lying down position is prone to pulmonary circulation stagnation, which leads to coughing at night, not coughing during the day. It is recommended that the child seek medical examination in a timely manner, to clarify the cause of the targeted treatment, pay attention to monitoring the condition in life, once the condition worsens need to consult a doctor in a timely manner.