It is relatively common for babies to have a more violent cough in the early morning. First of all, after a night of breathing, the dry air, which is not moistened by the nasal cavity, enters the baby’s respiratory tract directly through the mouth, because most children or adults sleep with their mouths open at night, which can easily lead to dryness of the respiratory mucosa. If the cough is caused by a respiratory infection, the child should be given cough expectorants before going to bed to relieve the cough, such as pediatric aminoglutethimide oral solution and pulmonary cough combination. In the case of cough variant asthma, the cough is more likely to be severe in the early hours of the morning, because at night or in the early hours of the morning, the vagus nerve is easily excited, resulting in spasm of the bronchial smooth muscle, which leads to a more severe cough.