A nocturnal heart rate of 37 means that the number of heartbeats per minute is at 37, and a nocturnal heart rate of 37 beats per minute is not normal. If the 24-hour average heart rate is less than 50 beats per minute, it is not normal and severe bradycardia is considered. If the 24-hour average heart rate is roughly 50 beats per minute or more, or if the total number of heartbeats is more than 60,000 and the maximum time between heartbeats is not more than three seconds, you can continue to observe. If the patient’s heart rate does not fall below 50 beats per minute during the day, and there are no symptoms such as dizziness, blackness, or memory loss due to a slow heart rate during the day when the patient is active or awake, then regular observation is sufficient without treatment. If there is any discomfort, consult a doctor promptly.