Yeah, I got almost EXCACTLY the same experience, Its like a rush of wind past your ears (like the sound effect in Lost, when it goes back in time). It also feels like your flying up and down randomly and its a really nice experience in my cases
Also, last night I felt this (after waking up half asleep) and then I remembered reading about scary hullucinations (which I have never hadafter doing this 4 or 5 times) so I stopped and fell asleep normally. WHAT A DICK.