A child lying down to sleep on the cough can be seen in respiratory tract infections, sinusitis or cough variant asthma and other conditions, the specific need to analyze and judge according to the child’s situation. 1. Respiratory tract infections: such as acute bronchitis or bronchopneumonia caused by Mycoplasma pneumoniae infection, coughing can occur, easy to appear at night, coughing is mostly presented as a dry cough, improve the Mycoplasma pneumoniae antibody test can assist in the diagnosis. 2. Sinusitis: the combination of rhinitis co-exist, more likely to appear at night nasal reflux, stimulate the cough, daily may be accompanied by nasal congestion, runny nose and other symptoms, and last a long time, improve the sinus CT and other tests can assist in the diagnosis. 3. Cough variant asthma: these children tend to have recurrent coughs, and the coughs are easy to appear at night, or after activities, etc., and the above phenomena can occur, and the perfect pulmonary function tests can see the increased airway reactivity. 4. Others: If the sleeping environment is not adapted to the temperature and the humidity is dry, the above phenomena are also likely to occur. There may be other reasons why children cough when they lie down to sleep, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.