hi ive been told my heart rate has dropped to the 30 several different times during 3 4 & 5 am i currentley have heart disease heart valve leaks mumor sever resistant hypertension. is my slow heart rate at night a problem conserdering i already have heart disease. its been 37s& 38s for some and lower for the rest . i am on alot of medicine. i also had a cardiac ablation in 2007 for svt. any help would be nice.