When I try to go to sleep at night or occasionally take a nap, I sometimes get a rapid heartbeat. It just happened to me while trying to get my baby to sleep. I felt funny, like I couldn't move and it really scared me! I have not done any type of physical exercise today, have not had more than a few sips of caffeine. I was so scared I was going to have a heart attack that I actually got up and into the chair so I would be by the phone...
I have migraine & tension headaches but thank God it eased off a lot. Right now I am just really concerned with the irregular, fast heartbeat. I hope it was maybe a mild anxiety attack or just because I was in that rest period and was noticing any small change.