There are many relatively thin patients who experience a feeling of a particularly fast and strong heartbeat after lying down, which is a relatively common phenomenon, especially when it occurs in a closed, quiet environment. Patients are mainly distracted from paying too much attention to their own heartbeat sensation, and there is usually no specific pathological factor. If the patient has a similar condition for a long time and it affects rest, it is recommended to improve the electrocardiogram to clarify if there is an arrhythmia or sinus tachycardia. If there is a similar condition, one may choose to apply drugs such as metoprolol to control the heart rate or other drugs to control the arrhythmia. Many patients may experience gradual improvement in their symptoms after persistent exercise and other measures to improve cardiopulmonary function.