Sleeping in the process of heartbeat suddenly beat very fast and fierce, considering tachycardia, may be related to coronary heart disease, cardiac neurosis, hyperthyroidism and other factors, should be given for the cause of the general treatment or medication, such as can follow the doctor’s instructions to take metoprolol, diazepam and other drugs. 1. Coronary heart disease: a relatively common cardiovascular disease, due to coronary artery stenosis or sclerosis, may induce acute myocardial ischemia, and the phenomenon of tachycardia. In the treatment must keep the mood relaxed, followed by some drugs to improve myocardial blood supply, such as isosorbide mononitrate, antiarrhythmic drugs, such as metoprolol tartrate, etc., for treatment. 2. Cardiac neurosis: the cause of its onset may be related to excessive stress, fatigue, insomnia and environmental factors, mainly manifested as panic, dyspnea and so on. The first thing to do is to keep your mood relaxed, and at the same time, you can give some sedative medication, such as diazepam tablets and so on. 3. Hyperthyroidism: is a relatively common endocrine disease, because of the metabolism of the heart rate accelerated, can be manifested as panic and other symptoms, generally can be given to propylthiouracil and other drugs for treatment. Due to more causes, should be timely consultation, under the guidance of the doctor examination and treatment.