When I WILD, this is exactly what happens. To find out if you are Astral Projecting, OBE or Lucid Dreaming, leave a book on your nightstand and find a specific passage in it when in that state. If the world is real, you will find it, will be able to turn away from it and back to it and it will be there and stable. If not, you are in an LD.

I was freaked out the first time this happened to me, exactly as you describe except I used WILD to get there. I did the test. It was and is a dream.