meet the doctor who's called a medical miracle, eben alexander.e harvard educated neurosurgeon, dr. eben alexander was defined by science and logic, dismissing all claims of the afterlife but four years ago a rare bacterial meningitis left him in a coma on the brink of death. >> at 4:30 a.m. on monday november 10, 2008, i almost died. i woke up that morning with an extremely intense headache and two or three hours my brain started to shut down and that's when i lost consciousness completely and went into coma. i was gone from this world. i saw something that was nothing short of a miracle. i saw heaven. dr. oz: what he experienced not only spawned his book "proof of heaven," it also redirected his entire belief system. >> i was in a very lovely, bright valley with puffy pink white clouds and was traveling on a

all is well. >> reporter: within weeks, eben alexander had made an astonishing full recovery. all of a sudden have basically a sixth sense, an awareness that there was something other than the physical world that surrounds us every day. >> i r had to completely rethink everything i had come to believe in. 30 years of science, chemistry, biology, everything i knew about the brain, mind, consciousness, i had to start over at square one. >> how are you different from going through this experience? >> my family said i am nicer. >> really it's changed me in every way by realizing that our souls are eternal. >> reporter: the book he has written, "proof of heaven," has sparked a lot of controversy. you know you do have skeptics out there who are just saying it's not uncommon for people near death to have all sorts of funky things going on inside their bodies. >> well, that's why the fact that i had meningitis that was so severe, i mean, that should not have allowed for any experience. >> reporter: dr. alexander maintains his brain was so completely shut down that the visions he had c