There are many reasons for this nighttime panic, we may have experienced each comrade, its common causes include: 1, the first reason is what we call night dreams, panic in nightmares, his heartbeat will naturally accelerate, this tachycardia will lead to sudden suffocation or the body awake, which is one of the most common factors as a physiological; 2, cardiac arrhythmia, because of the normal heart is a regular beating, about 8-10 million times a day, the daytime activities may heartbeat faster, night sleep may heartbeat slower, especially to sleep better quality, he tends to heartbeat are slower, will not appear panic symptoms, once the heart panics that he may be arrhythmia, that is, there is a transient atrial or ventricular arrhythmia, resulting in the accelerated heart rate and caused by a situation; 3, variant Angina pectoris, is the night coronary artery spasm caused by acute myocardial blood supply is not good, accompanied by sinus rhythm will accelerate, and even arrhythmia so a phenomenon.