Patients suffocating in their sleep at night mainly consider the following reasons: 1. The most common may be that the patient has chronic cardiac insufficiency and heart failure, and there will be an increase in the amount of return blood when lying flat. In addition, because the vagus nerve is excited at night, it is easy to cause the patient’s myocardial contraction rate to slow down, and the patient will easily hold awake at night. Patients in this category usually have decreased activity endurance and swelling of both lower limbs; 2. Patients who wake up at night with suffocation should consider the more serious sleep apnea syndrome, which often results in severe snoring, causing patients to wake up at night with suffocation; 3. Patients who wake up at night with suffocation may also be caused by enlarged tonsils, which will inhibit the body’s breathing and cause patients to wake up with suffocation.