first of all.... Steven, generally speaking, dysautonomia is life altering and difficult, but not fatal. There are, however, some exceptions. I don't know if that was supposed to make me feel bettter or not but it really didn't, I'm paranoid mostly about why this is happening and the fact that some exceptions are eventually fatal freaks me out even more, especially when what I have isn't very common (on this board anyways) and what I have could very well be the type that turns out to be fatal. What other symptoms do you get steve? and do you feel it everyday all day? What do you eat? Do you excersice? and Do you do ordianry things when you can? I have woken up once before with that feeling, but that was it (maybe just the beginning of this happening a lot more) I don't feel it all day everyday, because some days I don't feel it at all and I can go a while without it and sometimes I'll have it without it going away for a long while. I'm eating between 1500-2000 calories and have been exercising (trying to lose some weight). And usually I can do ordinary things without it bothering me, sometimes it will bother me while exercising but not often, and it basically only bothers me when standing up from sitting. Oh and another symptom that I don't think I listed was graying of the vision when standing although it hasn't bothered me in quite sometime now. I still can't believe you get the slow heartbeat when you yawn, I never mentioned that because I didn't think it was a common symptom at all.