Sleeping heart rate between 50 to 60 beats / min is normal. Normal people in a quiet state when awake heart rate between 60 times / min to 100 times / min is normal, special populations awake heart rate of 50 to 60 times / min is also normal, such as athletes, sleep state heart rate is generally more than 45 times / min, usually not less than 40 times / min is normal, so the sleep heart rate of 50 to 60 times / min belongs to the normal. The human body in the sleep state, the vagus nerve excitation, the heart rate will slow down, but the general heart rate is not less than 40 beats / min. If it is lower than this value, it is necessary to consider whether there are pathological changes, such as pathological sinus node, hypothyroidism, hyperkalemia, etc.. If abnormal heart rate is found, please go to the hospital promptly to avoid adverse consequences.