Often it is best to leave some things to those more able to fond the answers. What often is more important, on a personal level, is to actaully be able to experience something and make of if what *we* want to make of it and believe in. Even science, without such experiences/phenomena to study, would be a far poorer place and less of a challenge to those who love the experiences of query.
We all bring with us and contribure something to life's mosaic. The CAUSE is sometimes not so as important as the effect. I can never explain why I like a certain particular song/tune - while others may hate it - but that makes the experience no less valid. I am sure the actual reasons are simple, when compared to NDE, but all it confirms is that I am a sentient being thankful for such experiences and queries in life :-)