when i go to bed to sleep every night my pulse drops to 45bpm. some doctor said to me that because of my age (24yrs) that is normal, in the past i did a lot of exercise but it has been more that 6 months since i dont do exercise, is that a normal resting pulse rate for me?? (I have been taking clonazepam 2 time a day to treat anxiety disorder and panic attacks, i dont know if that affects my pulse)