Patients with bronchitis may experience a worsening of their cough when they sleep at night because the flat position is more likely to irritate the airway walls. In addition, because you can’t drink water when you fall asleep at night, the patient’s airways lose a lot of water, which causes the airways to be drier, so it can also make the cough worse. Because the vagus nerve is more excited when you fall asleep, it can also cause spasms in the bronchial tubes, which can lead to an aggravation of the cough. Night cough is more serious bronchitis patients, can be under the guidance of the doctor to take phlegm cough medicine and cephalosporin anti-inflammatory drugs to give treatment, but also try to sleep on the side lying position.