What does a NDE look and feel like? There are thousands upon thousands of descriptions, all of which show striking similarities between different people's experiences -- the white light, a tunnel, a life review and sense of peace -- so there does seem to exist a unifying thread throughout. Caroline Myss, a best-selling author and a speaker on spirituality and health, focuses on the first explanation. A near-death experience is a phenomenon in which a person's physical body ceases to have any signs of life, and the soul detaches from the body and begins what could be called the journey into the afterlife. ... A long tunnel of light begins to appear. ... What's so phenomenal is that the descriptions [people] give, no matter what culture, no matter what background, match the ancient descriptions ... from various cultures. So if these experiences were in fact made up or hallucinatory, somebody did a very good job of getting that information out to multiple cultures at the same time." Dr. Jeffrey Long runs the Near Death Experience Research Foundation. He defines the physical conditions of someone having a NDE as "unconscious ... or actually clinically dead, with absent heartbeat and no spontaneous respiration. ... And yet when they shouldn't have any conscious remembering at this time, they do. ... While no two NDEs are the same, if you study large numbers of NDEs you see that very consistent pattern of elements."