It most certainly is. Often this happens to people unintentionally when they become lucid. Doing it intentionally would be doable.

Keep in mind, if you were a floating conciousness you would still kind of have a drea body, but just a vaprous one. To truly become nothing but a conciousness you would have to be omnipresent within your dream, to have your concious everywhere at once within your subconcious creation.

That would be a nice goal if you were shooting for it.