I personally think there's room there for one to speculate on either side.
It would go all down to psi and whether you believe in it, if it is actually there, etc. etc. etc.
Although, I have been reading a book recently, "Psychic Dreaming" and deals a bit with psi, and I have also thought of the same thing, seeing that you are going into an altered state of consiousness, are you able to do "unexplainable" things with your mind?
I've often wondered if using the "Super Memory Charger" pariliminal tape or some other pariliminal tape could help you get into a state of mind where possibly OBE/Astral Projection would be obtainable.
It's fun to imagine. Any one else have comments?