The reason why you can hear the heartbeat while sleeping is complex, there may be cardiovascular disease, psychosomatic factors, physiological, or the sleeping environment is particularly quiet. When the environment is particularly quiet, the heartbeat sound through the air conduction or through the bed plate to the human skull bone conduction, it is possible to hear the heartbeat. Physiological such as drinking strong tea, coffee, emotional excitement and other cases of cardiac muscle contraction force increased, may also hear the heartbeat while sleeping. Cardiovascular diseases such as hypertension, arrhythmia, aortic stenosis. A heartbeat may be heard at night when blood pressure suddenly rises, or when premature beats or tachycardia occur and blood passes through a narrowed valve. Psychosomatic factors such as mental anxiety and nervousness, mental weakness, sensitivity to sound or hallucinations may also be heard during sleep. If the body feels uncomfortable with the heartbeat, go to the hospital in time to be examined by the doctor to make a clear diagnosis, do not take medication without authorization to avoid adverse consequences.