I have heard of Astral Projection, i think the first time was in Avatar the last airbender series and i only i assumed is a theory applied in movies, then i encountered some friends in high school that claim to have had this experience. As to whether it is very truly i cannot tell but then you also seem to have experienced so i guess there could be some truth to it after all. It would be an interesting experience...

Please check you images and reupload as they didn't come out well