Near-Death Experiences and Life After Death

People who were once near death have sometimes reported various mystical experiences (such as going into a tunnel and emerging in a light, being reunited with loved ones, a sense of peace, etc.) that may suggest an existence beyond the grave. While such experiences are profound, no one has returned with proof or verifiable information from "beyond the grave." Skeptics suggest that the experiences are explainable as natural and predictable hallucinations of a traumatized brain, yet there is no way to know with certainty what causes near-death experiences, or if they truly are visions of "the other side."

Source : livescience.com