A child’s coughing while sleeping may be due to positional factors, allergies, environmental factors and sinusitis. 1. Body position factor: the child’s sleeping position will lead to the child’s breathing is not smooth, which will cause coughing, generally change the body position can relieve the symptoms of coughing. 2. Allergy: allergy-induced variant asthma in children is usually more serious at night, mainly manifested in coughing when the child sleeps. 3. Environmental factors: If the indoor air is dry, it may stimulate the child’s throat to cause discomfort, which leads to coughing, you can use a humidifier, so as to alleviate the symptoms. 4. Sinusitis: Inflammatory stimulation coupled with postnasal drip and irritation of the throat may cause the child to cough. If your child develops the symptom of coughing as soon as he or she goes to sleep, he or she should seek medical attention.