Brief Answer: check K Detailed Answer: Hi there I am Dr Saumya Mittal, MD I am going to try and answer your query. First and foremost, a variation in heart rate between in sleep and wake duration is known. It is natural for people to have the change in blood pressure and pulse. However, even the resting levels are too low. In fact normal heart rate should be above 60. I can think of 1 important possibility from your query. The medicines you are taking may be increasing the potassium content of the body. this is a condition known as hyperkalemia. One of the effects of increased potassium in the body is decreased heart rate. I will therefore suggest you check the potassium levels in the serum. If they are high, a few medicines will need to be changed. I hope that answers your query For any further related query, please feel free to contact again Dr Saumya Mittal

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