It is not normal to make a heart rate of 34 beats/minute at night in bed. Often after taking medications such as metoprolol, diltiazem, or in the presence of severe hypoxia, hypothermia, hyperkalemia, hypothyroidism, and other conditions, it can also lead to a heart rate of less than 60 beats/minute. If the heart rate is measured at 34 beats/minute while sleeping, it is a case of severe sinus bradycardia, which is an abnormal condition. The patient needs to seek medical attention to identify the cause and treat it. Normally, the heart rate of a normal adult is between 60 and 100 beats per minute, with an average of 75 beats per minute. At the same time, the heart rate will fluctuate with age, gender and physical activity. In the elderly, athletes and during sleep, the heart rate may be lower than 60 beats/min, which is due to increased vagal tone and generally does not require special treatment. If any of the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.