I think your brain experiences hallucinations as it is deprived of blood flow and oxygen. This would very likely explain why many people share a common story after a similar experience of oxygen deprivation/near death.
...the life review for the unrepentant will occur at the White Throne Judgment and not before (Revelation 20:11-15). Our life review occurred at the foot of the cross when we acknowledged our sinfulness and unworthiness. God, full of mercy and willing to forgive, justified us in Christ (Romans 3:24). For us, the light at the end of the tunnel is the light of the Gospel shining into our hearts, a beacon guiding us through the perils of this dark and foreboding world to fullness in Christ (Colossians 2:8-9). Our final destination was made known when we were born again (1 Peter 1:23). Our new heart (Ezekiel 36:26) empowers us to walk in the Spirit (Galatians 5:16), abide in Christ (John 15:4), and live now in the presence of the Master (Romans 14:8). Further, since born-again believers have already passed from death to life (1 John 3:14), there is no scriptural reason to think any of us will travel down a dark tunnel to a bright light to undergo a life-review, and then to learn about our eternal fate. According to the apostle John, we should already know that our eternal fate is eternal life in Christ (1 John 3:15).http://www.blogos.org/keepwatch/eternal-life.php
Skeptics of near-death experiences will always be unable to believe there is anything to it, but there are a lot of similar accounts. According to a Gallup poll, approximately eight million Americans claim to have had a near-death experience. There is a bit of research to it, see here: http://en.m.wikipedia.org/wiki/Near-death_experience
When God created man God formed man from the dust of the earth then breathed into his nostrils the breath of life and mad became a living soul. Therefore when you die your body is put into a grave there to await the resurrection and judgment day.