The main reason for coughing at bedtime is that the vagus nerve becomes excited during the night. Vagus nerve excitement causes spasm of the bronchial smooth muscle, which triggers coughing symptoms at this time, which can be relieved by chewing a montelukast sodium tablet before bedtime. Montelukast sodium chewable tablet is a leukotriene inhibitor that inhibits bronchial spasm and relaxes the bronchi. In addition, treatment with nebulized inhalation, such as inhalation of bronchodilators, can be used. However, bronchodilators should not be used alone, but in combination with glucocorticoids. In addition, when you sleep at night, you usually breathe with your mouth open. Breathing with your mouth open causes dryness of the throat and tracheal mucosa, which can lead to an irritating cough. Therefore, drinking more water before going to bed or adding a humidifier to the room can improve the symptoms of coughing in bed at night.