Read, if you can find a copy, Life After Life, by a guy named Mood, or Moody, or something like that. He was an M.D. who did a pretty in-depth study of the near-death experiences of people from all over the world, of all ages, of all faiths, etc. It was a fascinating study. He later wrote another book very like the first.
You might want to try half.com to see if they have the book. They deal in old titles like that.
francois