Children sleep at night snot backflow, cough, mostly consider allergic rhinitis caused by allergens, to avoid contact with allergens, oral antihistamines, leukotriene receptor antagonist relief, or nasal use of glucocorticoids to improve. 1. children sleep at night snot flowing backward, mostly due to allergic rhinitis, snot flowing backward to stimulate the mucous membrane of the airway, thus causing the child to cough symptoms, so avoid contact with dust, pollen, mites and other allergens to reduce the occurrence of allergic symptoms, thus reducing the symptoms of runny nose, cough symptoms. 2. If the symptoms of runny nose and cough are obvious, antihistamines such as cetirizine can be given, or oral leukotriene receptor antagonist montelukast sodium, to alleviate the symptoms of allergic rhinitis, and the symptoms of runny nose and cough can be improved. 3. If the symptoms of allergic rhinitis are serious, you can also use glucocorticoid spray treatment with nasal cavity, such as mometasone furoate nasal spray, to relieve the symptoms of nasal mucosal allergy, reduce the symptoms of nasal discharge, cough. Children often appear snot backflow, cough symptoms, to take the child to the hospital in a timely manner to the ear, nose and throat department, clear cause to give targeted treatment.