There are many reasons why a child may have a bad cough in the middle of the night but not during the day. The first and most common reason is that the child’s vagus nerve is easily excited in the middle of the night. Once the vagus nerve becomes excited, it will easily lead to contraction of the bronchial smooth muscle, thus inducing abnormal contraction of the bronchus or trachea, which will lead to a strong cough. The effect is better. In addition, coughing in the middle of the night is due to the fact that children breathe with their mouths open and when they sleep, dry air enters the respiratory tract directly through the mouth without being moistened by the nasal cavity, and once the mucous membrane of the respiratory tract is dry, it is easy to cough due to irritation. Drinking more water before going to bed, or using cough and phlegm medicines can also relieve this symptom, for example, you can use some pediatric aminoglutethimide oral solution.