OMG!!
@Gingergrrl I have the very same!!
I already have this since I am 18 years!!
In me it works like this: I feel it coming, it feels like falling asleep but my head is markebly lighter, then I do fall asleep and am somewhere in between dreaming and awake, then all the sudden my heart is racing like mad .....
Also I am paralysed!
First time i had this I thought this was the end...
Heat is also a factor, as like stressors who leave me a full night without sleep, that evocate it clearly. I am extremely hot during this 'racing' while I want to escape, I might dream that I am escaping and my live goes on.... while I am still laying there ... then I realise that I might still lay there... Anyway at some point I succeed in moving a finger or something with very very much effort and then I jump-like awake and throw everything off me so the heat also stops: then it stops all the sudden. Leaving my heartbeat still clearly worried and "wobby".
I may have several attacks at one night (actually morning since they will rather occur after a night of very poor or no sleep).
To evokate it on a holter or intentionally I don't dare. It it to scary to me to do that.
The very very same!! Told this to so many doctors, some close friends, no one believed me, no one could explain. But it is the exact same thing as you explain here...
I use inderal (propanolol) if my hearts is behaving strage (unfortunately have other heart palpitations, bradycardy, tachycardie, arhytmia's too...) usualy it goes very parallel with my tiredness level. The more tired: the more crazy jumps my heart will make and let me know it is not okay anymore...