Most likely thing, and first thing that jumps to mind, is that it was an illusion created by your mind, but funnily enough, that dream is almost identicle to one described in a short story I read before, the main character in the story was a lecturer who theorised that dreams were merely our minds way of explaining a situation.
Eg: A dream where the character was trapped in a burning building, where he knew it was on fire, but couldn't see any flames. He could hear the fire engine's siren at one point, and when he woke up, the fire engine siren was in perfect tune with his alarm clock. So his mind's way of explaining the alarm was that he was trapped in a burning building.
This linked in with the flying dream, as he thought that maybe in his sleep, he was flying, the dream was generated in the last moment of sleep, when he begun to fall, his mind explained that falling sensation with flying.
My only experiance similar to this was when I dremt that i had won the lottery. I was watching myself from third person walking into an airport, having sold everything i own. Then, a bank offical told me that there had been a mistake and all the money was gone, includeing everything I had received from selling everything. After that, I fell backwards, fainting, and was watching my head hit the ground from a movie style perspective when suddenly, my head hitting the ground begun replaying over and over again, with me in different settings wearing different clothes, such as a kitchen with me wearing a cheifs hat (talk about disturbing...)
anyway, the last head to hit the ground was in actuality, my cat, at which point I said alloud "
What the hell??" Then my cat got up, hissed annoyedly and hopped off my bed, trotting out the open door. Apparently she had been sitting on my bed, and when I woke, I jolted and knocked her over
