I know what it is, and when it happens, but...

1 - What is really going on? I mean, why is it a falling sensation as opposed to, say, a "floating" sensation.

2 - Has anyone experienced it both ways? I mean, sometimes I can recall feeling like I was falling with my back to the ground, and other times I have felt like I was literally skydiving.

I ask because it came up again tonight. And it was really intense. Not that it is a bad thing, but I could feel my body picking up speed. I think I may have even began to sweat.

If there is any more info about this phenomenon, please post.

Thanks!
Bryan (HiL)