I've survived 8 near death experiences, and all of them were medical in nature. I have this medical condition (for those of you who are interested it's called pan-hypopituitarism i think) and because of it i would occasionally go into adisonian crisis, which basically means i go to bed one night and i dont wake up the next morning. The only recollection i have of these instances is waking up in the hospital the following afternoon and being told i was almost dead.