I will occasionally have the "falling dream" - you know, where you're falling from some unknown height. Usually for me, it takes the shape of swinging on some rope that's far too long for where it's tied, and I'll hit the ground or the side of some building, or whatever. Sometimes I find myself in a airplane with no top (of course) like an old-school biplane. Invariably that plane will fly some loops, and off I go.
The reason I bring this up is because I read a crazy article today on Popular Mechanics about surviving a fall from 35,000 feet. I doubt that I'll remember it next time I'm asleep and plummeting, but it's worth a read while you're awake.