If the patient feels the heart beating significantly when sleeping on the left side, it may be due to the patient’s own disturbance in the regulation of vegetative nerve function or a degree of cardiac neurosis. In some patients, it may be due to heart failure, but this possibility is relatively small. Patients are advised to exclude organic pathologies, such as cardiac ultrasound, BNP, ambulatory electrocardiogram and chest X-ray. If no problems are found after the examination, psychosomatic factors may be considered. Patients are advised to take appropriate medications to suppress sympathetic excitability, such as oral bisoprolol or metoprolol. In addition, patients are advised to relax more, which will also help to improve the current discomfort.