When you feel a sense of suffocation during sleep, most of them are due to lack of oxygen caused by the wrong position of sleep, there is an obstruction of the airway will lead to poor breathing will lead to lack of oxygen, common are chronic rhinitis, sinusitis, tonsillar hypertrophy, allergic diseases, apnea syndrome, need to go to the hospital to do the appropriate examination to actively treat these diseases. There is also a bad heart, chronic respiratory disease, due to the increased amount of cardiac blood return during sleep, parasympathetic excitation and other reasons can affect the cardiopulmonary function caused by a sense of suffocation. It is necessary to actively treat and enhance the cardiopulmonary function, and also to exercise properly to enhance physical fitness and prevent infectious diseases of the respiratory system.