A nocturnal heart rate of 47/minute is usually normal if it is during sleep. The resting heart rate of a normal adult is 60 beats/min to 100 beats/min, and a heart rate of 47/min is not normal if it is during waking hours. However, if the heart rate is 47/min while asleep, it is mainly due to the elevated excitability of the body’s parasympathetic nerves, which is generally normal. However, attention should be paid to distinguish between pathological conditions, need to be combined with the patient has not appeared dizziness, black eyes, or even fainting symptoms, necessary to exclude the cerebrovascular and cranial brain part of the lesion, whether caused by bradycardia. If the patient is awake with a heart rate of 47/minute, he needs to go to the hospital in time, and through the 24-hour dynamic electrocardiogram, the professional doctor will assess whether there is a prolonged sinus arrest or a high degree of atrioventricular block, or even a third-degree complete atrioventricular block.