What causes near death experiences?

I don't mean to be..: Silly, but i can't resist saying "coming near death". Beyond that, i there are very serious researchers doing good work on this for decades +.You can find their results in long journal articles & in books or magazines written for everyday folk. It is not hard to believe that some bodies experience a lot at that time and, surviving it, people may retain powerful impressions. Talk w/ your therapist.