Thanks for the reply, Corina. I, too, have an Omron bp/hr machine. It works well enough, I guess. I get a lot of error messages due to rapidly fluctuating rates. I have never caught an extremely low rate on the Omron - I think just moving to get it makes my heart go into low 60s. I use a Sportline analog watch/HR monitor. I started using that because I couldn't handle the strap all the time with other HR monitor due to the heat in the summer. Also I can sleep in the watch and do a quick check of HR without pulling out the BP machine right before getting out of bed and then upon standing. The 50 rate after waiting a few minutes happens rarely in the night - it just won't register below that. It has registered for me 50 to 145. Whenever I take my BP it matches the Omron and matches within 2 or 3 beats the equipment at my new Y. I guess I'll accept the limitations especially as I am now going through a period where my heart races in the middle of the night and I will get readings of 110. Can't stand this stuff.