Yeah, I have heard of OBE cases where a person actually moved a box in front an audience, but Aquanina's post presents a better one because it involves scientific instrument that captured the presence.
What I think is that we do not know nearly enough about the dream world to dismiss this idea based on reason.
There is an interesting story about a psychic who could go out of body and perform a task, a fairly advanced one, for example to let a spouse of a person know of their whereabouts.
I think that there are myriads of possibilities out there, and that there are different types of philosophers, some that think till they get a headache, and some that experiment. I having the idea that there are tons of unexplored possibilities, am the experimenter type, dont get me wrong I also think. To me these unexplored possibilities are the most valuable treasure.