The causes of slow heart rate and weak heartbeat during sleep can be categorized into physiological causes and pathological causes, according to the specific causes to decide the next program, physiological generally do not need special treatment, pathological causes need to be diagnosed and treated. 1. Physiological reasons: normal people sleep at night due to the vagus nerve tension increases, resulting in a slow heart rate, weak heartbeat, which belongs to the physiological reasons, usually does not cause discomfort, do not need special treatment, so do not have to be too nervous. 2. Pathological causes: Some pathological factors such as hypothyroidism, increased intracranial pressure, obstructive jaundice and overdose of digitalis, quinidine or cardiac glycosides can cause slow heart rate, which is more pronounced during sleep and may cause symptoms such as chest tightness. At this time, it is necessary to consult a doctor in time to complete the relevant examinations to assess the degree of heart rate slowing, and to find the cause of the disease to treat the cause. For example, if the heart rate is caused by hypothyroidism, supplement thyroid hormone; if the heart rate is caused by increased intracranial pressure, lower the intracranial pressure; if the heart rate is caused by medication, stop the medication, and so on. If the heart rate is lower than 40 beats per minute, it should be considered that there is sick sinus node syndrome, atrioventricular block and other conditions. If the pulse is unequal in strength, irregular and less than the heart rate, atrial fibrillation should be considered, and a pacemaker may be required if necessary. If the heart rate slows down significantly during sleep or is accompanied by obvious symptoms, it is recommended to consult a doctor in a timely manner, complete the relevant examinations under the guidance of a physician to clarify the cause of the disease and seek early treatment, so as to avoid delays in the condition, which may lead to adverse consequences.