I've had recurring dreams, one of these is where I have found myself in a normal social situation, and all of a sudden my legs will bend both forwards and upwards until I'm floating in the air, upside down. Usually, I will tell the person I'm speaking to in the dream that its a physical condition I have, while at the same time I'm trying to hold myself down by backing against a wall. When I wake up, I usually walk around the house for an hour, aimlessly, and afraid, of what I don't know. The strangest thing is that during this dream I am aware that I'm dreaming, which is why I give the excuse of the "condition", and I can actually feel my legs physically twisting and writhing, trying to hold ground. This is when I wake myself up, which is probably the reason for my reaction upon waking. The mind can play strange games at times, most people have these problems in some form.