I've heard this is a quite a common one..I've had it many times...

Basicly, very simple...Just walking down a road and you trip over and as soon as you hit the ground...In slow motion it seems, you wake up with a big shock, like someone who just made you jump! Sorry for the second post, was just interested.

Cheers,

This is likely to be a hypnic jerk.

Does this happen just after you've fallen asleep, at the beginning of a dream, or does it happen later on in the dream, after there has been a long, complicated story and you are walking down the road for a reason that has to do with what is going on in the dream?