There are several possibilities for rapid heartbeat after waking up from a nap: 1, related to poor sleep quality, such as nightmares or sleep environment is not quiet and other factors; 2, drank strong tea, coffee, causing sympathetic excitation, inducing tachycardia; 3, fever, hyperthyroidism, anemia and other diseases, can also cause tachycardia; 4, sleeping in the wrong position, usually if there is cervical spondylosis, sleep position may cause The nerve receptors next to the cervical spine are stimulated, inducing tachycardia; 5. Sudden onset of angina pectoris or a sudden rise in blood pressure can also cause a rapid heartbeat. If the occasional rapid heartbeat does not need to worry too much, try to lie flat and breathe deeply, can relieve the symptoms. If the heart beats faster every time you wake up from a nap, it may be related to arrhythmia, you can go to the hospital to do electrocardiograms and other related tests to clarify the cause before treatment.