How is the child always coughing in the middle of the night to return a responsibility

Children cough in the middle of the night, considered to be caused by airway hyperresponsiveness, there will be irritating dry cough, seen in cough variant asthma, need to take the child to the hospital for bronchodilator test and other examinations. If the result is positive, there is a risk of asthma, should be treated in time.