If the patient has symptoms of chest tightness at night while sleeping, this condition is highly considered to be caused by the presence of resting angina, and it cannot be ruled out that there is already a more serious stenosis in the coronary vessels of the patient, and if the patient has frequent episodes of this condition, further coronary CT examinations should be performed. Some patients may also have similar abnormalities due to aortic stenosis or hypertrophic obstructive cardiomyopathy. In addition, for some menopausal women or women with menstrual disorders, if there is chest tightness before bedtime, it is not excluded that it is caused by cardiac neurosis or disturbance in the regulation of plant nerve function.