Nocturnal awakening and rapid heartbeat are common clinical symptoms, caused by the following reasons: 1, related to the content of dreams, in the case of nightmares, people in shock will suddenly wake up, can appear increased heart rate, sweating more, etc.; 2, heart disease, the vagus nerve excitement at night rest, blood flow is slow, if there is a history of coronary arteriosclerosis can appear coronary heart disease, heart failure and other diseases If you have a history of coronary arteriosclerosis, you may have coronary heart disease, heart failure and other diseases, such as dyspnea, increased heart rate, sitting breathing and other symptoms, you can check the electrocardiogram and cardiac function to confirm the diagnosis; 3. Usually avoid getting cold and overexertion. It is better to go to further examination and confirm the diagnosis when the above symptoms appear, and rule out heart disease first.