If children cough after waking up from sleep, consider allergic cough or upper respiratory cough syndrome. The main reason for this is that the capillaries in the mucous membrane of the pharynx of children are richer and are easily stimulated by cold, heat or foreign bodies, causing a protective cough in the pharynx. Children sleep for a long time at night and are in the recumbent position. Children lack swallowing movements, so if nasal secretions flow backward to the pharynx and accumulate, or if the pharyngeal mucosa lacks lubrication and replenishment of water, as well as the inhalation of cold air, it is easy to cause symptoms of discomfort due to pharyngeal movements after waking up, which can be relieved by drinking water. Therefore, it is necessary to drink more water before going to bed and increase the humidity of the room to keep the airway moist by breathing, which can effectively relieve the symptoms of cough.