What happened to breathing difficulties in the middle of the night, chest tightness and shortness of

Dyspnea in the middle of the night, chest tightness and shortness of breath may be due to increased vagus nerve excitability during sleep, which causes coronary artery contraction, resulting in decreased myocardial blood supply, decreased vital capacity during bed sleep, and increased venous reflux in the lower body, which exacerbates pulmonary congestion, resulting in nocturnal paroxysmal dyspnea. This phenomenon is more likely to occur when patients suffer from hypertensive heart disease, coronary heart disease, rheumatic heart valve disease, myocarditis and other diseases. Should be admitted to hospital in time for ECG examination, heart color Doppler examination to diagnose the cause.