Staying up all night is harmful to the heart and can lead to the emergence of cardiovascular diseases such as insufficient blood supply to the heart, arrhythmia and myocardial infarction. 1. Insufficient blood supply to the heart: staying up late for a long time will cause arteriosclerosis of the blood vessels, leading to circulatory disorders and other diseases, reducing the blood supply to the heart, resulting in chest tightness, fatigue and other symptoms. 2. Arrhythmia: staying up late for a long time will excite the sympathetic nerves, thus triggering arrhythmia. There are slow arrhythmia and tachyarrhythmia, which can cause symptoms such as darkness, dizziness and panic. 3. Myocardial infarction: staying up late for a long time will make the vegetative nerve disorder, which will lead to increased oxygen consumption of the myocardium, affected by blood pressure fluctuations, blood supply disorders, etc., which will cause serious ischemic events of the heart, myocardial infarction and other organic changes. In daily life should try to avoid staying up late, when the body is unwell, need to actively consult the doctor, follow the doctor’s instructions for reasonable treatment.