I've been monitoring my heart rate since I was a teenager (after reading Cooper's Aerobics). I've done it at various times (morn, afternoon, night). Everytime I see one of those blood pressure machines I'll take a reading. I'm very careful about over training and take 3 rest days during the week. Every six to eight weeks I'll take a week off completely and do absolutely nothing. I sleep pretty soundly and when I do take it in the morning it's when I just wake up. No matter what, it's always in the nineties. One thing that I find curious: when I take a reading on those BP machines you find at drug stores, with each succesive measurement (I take about four), as I get more relaxed, my blood pressure goes down but my heart rate actually increases. Not by much, say it starts at 92 it then goes to about 96 by the fourth reading. Still, you would think as I just sit there my heart rate would decrease like my blood pressure does.