Children coughing in their sleep may be due to physiological factors, or postnasal drip, allergic cough and other pathologic factors. 1. Physiological factors: the air is dry, or at night when the child’s oral secretions are more, can trigger the child’s physiological cough. 2. Postnasal drip: atrophic rhinitis, allergic rhinitis and sinusitis, etc., a large amount of nasal secretion, when the child sleeps lying down, the secretion can drip along the back of the nose into the throat, resulting in irritating choking cough. 3. Allergic cough: Allergic cough is characterized by frequent nighttime episodes, usually dry cough, not accompanied by sputum or only a small amount of mucus. Children cough in their sleep, there may be other reasons, it is recommended to actively seek medical attention to find the cause, if necessary, with the doctor’s treatment.