Occasionally i have hrs of ~ 55 during day dropping below 50 while sleeping. bp also heavily fluctuating (150/75, 120/60 , 115/105). little activity

Bradycardia: Hi kevin, at your age, heart function can be quite dynamic as can blood pressure. Athletes tend to have lower heart rates than non-athletes. Also, your heart will be slower overnight. The question is:" are you having symptoms?" If dizzy, weak, short of breath, or palpitations, see your doctor. Otherwise, be reassured that it is probably okay, and stop checking it so often. Hope thats helpful.