Mine is in the 50's, got a sleep study done and it was 42 - 45 sleeping and they freaked out said if it drops below 40 I was at risk for HF, then saw the doc and he laughed the report out of the office. Apparently brachycardia is the opposite of tachycardia and common in people with heart problems/failure/attacks etc. He saw that I was very active and young and healthy. It used to be in the 70's when heavier and gassing up, never did much T3 clen or ephedrine only caffeine and some nicotene. Tren GH and slin would make it rise as well.