A heart rate of 60-100 beats/minute is normal when lying down. In adults, a quiet heart rate of 60-100 beats/min is normal. Lying down is generally in a quiet state, but if the night sleep lying down, because this time the vagus nerve is more excited, the heart rate may be slightly lower than during the day, up to 50 beats / min or so, there is generally no special discomfort, so lying down the heart rate of 60-100 beats / min, sleep can be slightly lower. Abnormal changes in heart rate are often closely related to heart disease. If the quiet heart rate is more than 100 beats/minute, or less than 60 beats/minute, and there are symptoms such as chest tightness and panic, it is mostly seen in patients with heart disease. If the monitoring heart rate is abnormal and there is obvious panic discomfort, it is recommended to consult a doctor in time, and early detailed examination should be carried out in order to treat the cause of the disease.