Agree entirely with Sqad with regards to explanations for near death experiences... I suspect there is a lot to learn in this area still (as in ghosts, ghoulies, apparations and beareded men in tunnels) but I don't doubt that the explanation will be entirely logical and plausible.
I personally think those that claim to have out of death experiences are just experiencing their brain shutting down, I don't know or understand how that works but it certainly makes more sense to me than the idea that a set of useless emotions that are exclusively yours live on after your body is worm food.