The physiological factors such as mental concentration, drug factors such as digitalis, and disease factors such as coronary heart disease may be related to premature beats after lying down. 1. Physiological factors: after lying down, the spirit may be highly concentrated, resulting in increased sympathetic sensitivity, which may trigger a strong premature beat after lying down. In addition to high mental concentration, it may also be related to excessive fatigue, emotional excitement and other factors. 2. Drug factors: If you take digitalis, quinidine and other drugs recently, due to the toxic side effects of drugs can disturb the normal rhythm of the heart, appear lying down after the premature beats, fatigue, dizziness and other symptoms. 3. Disease factors: also seen in coronary heart disease, mitral valve disease and myocarditis, due to the decline in cardiac function and myocardial electrical activity arrhythmia, there may be lying down after premature beats frequently, chest tightness and other symptoms. Continuous occurrence of this situation does not relieve, it is recommended that timely medical treatment, so as not to delay the condition.