Sadly, I have not found anyone who can leave and return at will. And I, myself, an atheist, have met Lucifer Morningstar here. The Devil himself. And even he couldn't leave.

[ He felt that explained enough. He sighed a little at the question. Sitting up to take his coffee, looking Leon in the eye.]

It is very much true. I have not only seen it happen, but it has happened to me. Normally, you lose memories or something like that after, at least for a while. That did not happen to me. I was killed and then awoke again when everyone else arrived. Perfectly cognitive. They can be taken to the morgue, but even so, they will return to their bed and vanish from where they are after a few days when they awake.