Normal human heart rate is 60~100 beats per minute, and it is normal for the heart rate to be in this range at night. Heart rate in a day will have certain changes, daytime to faster, the night to relatively slower, most people as long as not less than 60 beats per minute, the highest not more than 100 beats per minute belongs to the normal, athletes or heavy laborers due to the strong cardiac output rate, there may be a slightly slower heart rate, especially at night when the heart rate of sleep is even slower, it may drop to about 50 beats, which is also considered normal. How much normal heart rate at night can not be generalized, when the body functions well, the heart can meet the blood supply and oxygen demand of the body with one beat of the ejection volume, there is no need to speed up the heart rate to meet the demand, and there is nothing wrong with a slower heart rate, if it’s too fast or too slow, you need to go to the hospital to seek medical attention.