I'm a 40 year old female, non-smoker. Over the past few months, anytime I wake up at night my pulse is beating so fast that even my hands are shaking. It's not overly stong, but just fast. I dont feel short of breath or anything. It calms down within 20 seconds or so. Has anyone heard of this? :rolleyes:

I have also noticed on the workout machines that track your heartbeat, during a long exercise, my rate will go down while I'm keeping the workout intensity, then it will go back up. Has this happened to anyone?