That is a bit nieve. There have been consistant NDE's or Near Death Experiences, the scientific term, that have been documented. Most of which occured after the patients brain stopped functioning. I personally had my own near death experience 2 years ago which is about the same time that I started waking up or becoming conscious.
Here is a detailed link that describes one of the more profound and famous NDE's from Mellen-Thomas Benedict, I highly suggest you read it to get more perspective on the subject