Acute myocardial infarction can occur at any time of the day, but it is more likely to occur in the early morning or from 3 to 5 a.m. Because the body’s vegetative nerve function is mainly sympathetic at this stage, sympathetic excitation may lead to abnormal relative contraction of coronary arteries and rupture of plaque. After the occurrence of acute myocardial infarction, it is necessary to go to a regular chest pain center for treatment in a timely manner and choose thrombolysis or coronary intervention. People with acute myocardial infarction must take precautions in general, do not exercise too vigorously in the morning, pay attention to getting up slowly in the morning, do not get emotional, and do not eat a lot in the morning.