Sleep puffing can be caused by nasal stenosis, improper sleeping posture, respiratory tract infection, and so on. 1. Nasal stenosis: Usually when patients suffer from nasal polyps, enlarged turbinates and deviated septum, the nasal passages are narrowed and air entry will be blocked, which may lead to the phenomenon of sleeping puffing and exhaling. 2. Improper sleeping position: normal people usually sleep with their head tilted to one side, if they are used to lying flat, the airway may be blocked, leading to the phenomenon of sleep puffing. 3. Respiratory tract infection: usually when the patient has bronchitis and pharyngitis, the mucous membrane of the airway is congested, the secretion increases, and the airflow will be blocked, which affects the breathing, and leads to the phenomenon of sleeping poof vomit. There may be other reasons for sleep puffing, it is recommended that patients seek timely medical treatment, and under the guidance of professional doctors to identify the cause of the standardized treatment.