Premature beats while lying down may be due to physiological factors, such as insomnia, excessive alcohol consumption, emotional anxiety, etc.; it may also be due to pathological factors, such as coronary heart disease, high blood pressure, etc. 1. Physiological factors: such as chronic insomnia, alcohol consumption, smoking, and emotional anxiety, tension, irritability, etc., may occur when lying down premature beats. These factors may lead to over-excitement of the central nervous system, which may induce atrial preterm contraction, so premature beats may occur, but usually without organic lesions. 2. Pathologic factors: (1) Coronary heart disease: it is a kind of organic lesion of the heart, when arterial narrowing occurs and blood flow cannot pass normally, it may cause premature beats, which is also a kind of arrhythmia. (2) Hypertension: the seriousness of the condition of some hypertensive patients may cause overburdening of the left ventricle, which further causes deformation of the ventricular myocardium, and the structure of its chambers will be gradually enlarged, and when it triggers fibrosis of the myocardium, premature beats will be triggered. Premature beats when lying down, in the absence of a clear cause before unauthorized use of medication, should promptly consult a doctor, and then analyze the cause of the disease according to the relevant examination, and comply with the doctor’s instructions to carry out regular treatment.