Sleeping and feeling the heart beating obviously can be seen in normal people, but also may be heart disease, hyperthyroidism and other causes, the patient should consult a doctor in time to clarify the cause of the disease. 1. Physiological conditions: If you drink strong tea or coffee before going to bed, or wake up after a nightmare and feel your heart beating obviously, it is a normal situation, and this kind of people should change their lifestyles and do not drink strong tea or coffee before going to bed. 2. Heart disease: common heart disease that can cause the heart to beat obviously when sleeping are heart failure, angina, the former have basic heart disease, the latter will have chest pressure and other symptoms, should be under the guidance of the doctor in time to use the appropriate drugs for treatment. 3. Hyperthyroidism: a clinical syndrome caused by too much thyroid hormone in the body, patients will have symptoms such as feeling a significant heartbeat while sleeping, polyphagia, lethargy, palpitations, etc., which can be treated with drugs such as methimazole under the guidance of a doctor. It is recommended that if the symptoms are not relieved after rest, consult a doctor as soon as possible to avoid delaying the condition.