Suddenly accelerated heartbeat in sleep needs to find the following reasons: first, arrhythmia, the most common is paroxysmal supraventricular tachycardia, in addition to the normal conduction pathway of the heart, there is an abnormal conduction pathway between the atria and ventricles, abnormal conduction pathway is prone to cause rapid arrhythmia, do radiofrequency ablation can be eradicated. Secondly, hyperthyroidism can secrete too much thyroid hormone, which increases the excitability of sympathetic nerves and makes the heart beat faster. Third, patients with anemia are prone to rapid heartbeat due to lower hemoglobin, reduced oxygen transport capacity, and relative hypoxia in various tissues and organs. Fourth, bad habits, such as staying up late, anxiety, sleep deprivation patients, improve sleep, regular exercise, help to relieve.