This book compares the responses from people of differing ages, races, financial status, religion. It’s absolutely fascinating.
What is amazing is that with the differences especially in cultures and religions, the near death experiences are very similar.
You’re body is dead when the blood is dead. Cells saturated with CO2=No useful organs for transplant.
How long does the brain function in undetectable fashion? Until the blood is dead. All nourishment consumed by the cells, the co2 unable to leave; brain shutdown begins.
oxygen reduction=increased hallucination.
For pilots flying at high altitudes, one of the big warning signs of oxygen reduction is euphoria; an increased sense of well being.
The book may be interesting, even emotionally moving, to the natural man, but nothing concrete to build on if it doesn’t harmonize with the Word.