A more severe cough at night may be related to vagus nerve excitation at night, dry air, lung inflammation, reflux esophagitis and other reasons. 1. Vagus nerve excitation: the vagus nerve is more excited at night, which leads to bronchial smooth muscle contraction and increased respiratory secretion, which can easily lead to aggravation of cough. 2. 2. Dry air: If the indoor air is dry at night, deeper breathing during sleep will easily cause dryness of the throat and airways, resulting in a more severe cough. 3. inflammation of the lungs: lungs with inflammation, such as pneumonia, at night after lying down to fall asleep, respiratory mucous membrane secretions can not be actively discharged, phlegm collection on the airway stimulation, can cause severe cough. 4. reflux esophagitis: if you suffer from reflux esophagitis, when you lie down at night, the stomach acid refluxes to the throat, which can easily trigger a cough, leading to a more serious cough at night. There are other reasons that can lead to more severe cough at night, if the patient has frequent cough at night, it is recommended to go to the hospital for timely consultation, to clarify the cause of the disease, and active treatment.