Oh, and the not realising you're dreaming bit is definitely like a hypnic jerk. You sort of start dreaming without realising it, right?

P.S. Try harder finding thread titles :-). Just something lame like "Question: Strange thing that happened to me when falling asleep" would be nice. I know it's hard to pin something like this down in the title, but if you make an effort to find a longer title then it's easier to find / remember in future etc.