When cardiac discomfort occurs before bedtime, the first consideration is arrhythmia, which can present suddenly with palpitations, panic, and chest tightness. High vagal tone at rest causes atrioventricular block. If variant angina is present, pain in the precordial region before bedtime can also be present, the pain can be located behind the sternum, and there is a direct relationship with coronary artery spasm, often combined with narrowing of the lumen caused by coronary atherosclerosis. If there is a cardiac neurosis, can also appear, and the patient’s personality, mental stimulation, excessive work pressure, external stimuli, etc., often combined with the problem of vegetative nerve disorders, can be at the same time insomnia, dreamy, frequent urination and other manifestations. If there is obvious discomfort in the precordial region, you can consider going to the hospital for a 24-hour electrocardiogram, cardiac ultrasound examination, etc., and most of them can be significantly relieved after regular oral medication.