If the patient experiences cardiac discomfort while sleeping at night, it is considered that it may be resting angina pectoris and the patient is advised to take heart pills or nitroglycerin to help avoid the onset of discomfort. Patients are also advised to measure their heart rate and blood pressure, and then to do an electrocardiogram to observe whether there are any current electrocardiogram changes. If there are electrocardiogram changes, it cannot be ruled out that it is variant angina pectoris or that acute coronary syndrome occurs. In addition, some patients may also be caused by cardiac neurosis, especially those with long-term insomnia, poor sleep quality, and dreaminess, who are prone to cardiac discomfort during sleep. It is recommended that patients can have a coronary CT examination if necessary, which can also be combined with the examination of dynamic ECG to clarify whether there is a serious lesion of the heart vessels at present.