Poor sleep can lead to myocardial ischemia, poor sleep can lead to myocardial ischemia, because poor sleep can cause the following points: First, it can cause an increase in blood pressure, especially in patients with previous hypertension, in long-term sleep deprivation can easily cause an increase in blood pressure. After the increase in blood pressure can cause changes to the heart, causing hypertensive heart disease, panic and chest tightness. This is when the electrocardiogram may have ST-segment abnormalities, there will be myocardial ischemia performance. Second, poor sleep, especially in patients with previous coronary artery disease, is easy to have another attack of heart disease, chest pain, unexplained chest tightness, acute myocardial infarction or angina attack, when the electrocardiogram also has ST-segment depression or elevation, so poor sleep may lead to myocardial ischemia.