A doll’s strong cough at night may be caused by common cold, bronchitis, pneumonia, pharyngitis, allergic rhinitis, sinusitis, asthma and other diseases; it may also be due to the increase of bronchial secretion at night due to vagus nerve excitation, resulting in the intensification of contraction of the bronchial smooth muscle, and the worsening of cough. When suffering from the above diseases, on the one hand, the respiratory mucosa is inflamed and swollen, triggering the cough reflex; on the other hand, due to phlegm stimulation of the respiratory mucosa, it will also trigger the cough reflex. At night, the receptors located in the respiratory mucosa are more sensitive, coupled with the vagus nerve excitation to increase bronchial secretions, so the cough worsens at night. When this situation occurs, should keep the bedroom air circulation, you can give the doll a small number of times to feed some warm water, to maintain the lubrication of the throat, but also can be a doll’s head a little higher, to reduce the pressure of the respiratory tract and secretion of the stimulus. Dolls coughing heavily at night should seek medical attention and follow the doctor’s instructions for treatment.