Well there are really only two logical answers to this question.
The first is that nothing happens because your conciousness is an epi phenomenon of your brain. When it's dead, you are gone. Some may experience the below just before death.
The answer would be based on statistically analyzing NDES. And is the position that your brain is a receiver of conciousness and when it's dead, your awareness goes back to where it came from.
1) you may see your self outside of your body
2) a life review of your entire life will spin through your awareness
3) you will have the feeling of traveling through some sort of tunnel into what you will perceive as a bright light.
4) at the end of this tunnel benevolent spirits will be waiting for you. These are unusually passed family members and sometimes a much more overwhelming loving presence. For a small portion of people usually people who have particularly bad to words others the spirits seem not benovolant.
5) then there is place, for most, of overwhelming love and release.
Take your pick. They are equally logical, neither requires faith, and the only thing for certain is that one or the other will happen to you evenchually. Oh, and you will have to pay taxes along the way
"To know oneself is to study one self in action with another person. Relationship is a process of self evaluation and self revelation. Relationship is the mirror in which you discover yourself - to be is to be related."---Bruce Lee