There are three reasons why coughing is particularly strong at night, generally speaking, as follows: 1. The situation is most common when sputum is not discharged after the recovery from inflammation. Because most people have a cold, coughing after a cold usually invades the airways or causes bronchitis, and in this case it takes a while to drain the phlegm. Moreover, after a cold, because the appetite is not very good when you have a cold, you are anxious to eat heavy flavors when you get well, and when you are almost well from a cold, it is actually the time when the cough is most likely to continue, and if you eat too heavy flavors you will cough at night. The airway is horizontal when you lie down while sleeping, and phlegm is more likely to float up, so that once you reach the large airway and pharynx, you will have a cough. 2. allergies, because there are a lot of mite debris in the bed, and if people who are allergic to dust mites often have a cough at night. 3. the temperature in the room is too high, perhaps like the northern region in winter with heating and hot and dry, in this case the respiratory tract if it happens to be If the respiratory tract is also dehydrated, it is particularly likely to trigger a cough. At this time, it is necessary to humidify the room appropriately, and water vapor humidification is more recommended.