If your baby coughs at night while sleeping, there are several reasons for this: i. The respiratory tract is less hydrated when sleeping and can be dry, which can easily stimulate the throat with coughing symptoms. Second, children with rhinitis will have nasal secretions flowing into the throat after they fall asleep, which will stimulate the throat and cause coughing symptoms. Children with allergies or asthma are prone to allergic reactions to various factors such as indoor air dust or bedding dust after sleeping, or airway spasms caused by vagal excitation, resulting in coughing symptoms. 4. Children with poor digestion may experience coughing symptoms due to gastroesophageal reflux and irritation of the throat by the refluxed food.