sometimes your subconscious can do things like that.

have you ever done the trick where if you lean your hand hard against a wall for around 30 seconds and then stop. your arm extends without you willing it to do so. its because of your subconscious. it guess thats where most displacement feelings come from.

or sometimes i just feel pretty high on life and feel all light as if nothing matters anymore.

your mind can play tricks on you when your tired.

there are loads of things that can give you a wierd feeling but i dont recall any out of body feelings happening to me. they probably have but i probably dont know for certain what your talking about.