When you sleep at night, try to breathe mainly through the nasal cavity, do not open the mouth to breathe, after breathing through the mouth may be dust, dust mites directly inhaled into the airway, because the oral cavity does not have cilia, villi can block the invasion of these pathogenic microorganisms that may exist. You can choose the side lying position, you can choose the left side lying position, so that the airway is not compressed, especially for patients with chronic pharyngitis or chronic tonsillitis, with severe deviated nasal septum and adenoid hypertrophy, or even with postnasal drip syndrome, it is easy to make the airway obstruction and lead to open-mouth breathing, so the side lying position can ensure that the airway is unobstructed. In addition, you can try to place a humidifier in the room at night when you sleep to prevent the air from being drier, which is also very good for breathing and prevents the airway from being too dry and causing an irritating cough.