There are several reasons for coughing at night: 1, if there is inflammation inside the lungs, when there is phlegm, it is like a bottle of water, if the person is upright during the day, regardless of sitting or standing, the lungs are in a vertical state, and the mouth is where the phlegm comes out, it is also like a bottle placed upright, when lying down at night, if there is a bit of water inside the bottle although it is not coming out when upright, but This is also the case at night when the lungs are more likely to produce phlegm when lying down, which then leads to coughing. 2. There is also a situation at night when the indoor environment is dry during sleep, because of repeated breathing, and the breathing is deeper and larger during sleep, this time it is easy to sleep at night in the process of repeated airflow triggering the airways inside the more dry. The most important thing is to make sure that you have a good understanding of the environment. However, because the residual heat in the body is not cleared when the body is diseased, at night it lies on top of the yin part, so it cannot be fully absorbed into the yin part because it is not the normal yang energy, so at night the yang energy is too heavy and causes an irritating cough. 4. It is the Chinese diet that dinner is a particularly important meal, and at dinner most people eat richer and heavier tastes, and when the tastes are heavy If there is not enough water to neutralize these overly thick flavors at the same time, it can also cause a cough in the evening. Therefore, it is generally recommended to eat a slightly lighter diet in the evening, or to drink water appropriately after dinner, or to eat some fruit to neutralize the salty or spicy thick flavors.