I just thought I would mention this wasn't like sleep paralysis or a dream...and really science can't 100% explain what a person experiences at near death. Yes, I accept the scientific explanation up to a point, but I've had OOE, journeyed while awake, dreamed of course, and this was a different sensation. I have almost died several times in my life and have experienced the deprivation hallucinations, but this felt different and affected me differently.
But I do realize that my experience is subjective and that science would tell me that it was all due to oxygen deprivation.