I believe that we become non-existant, and become reborn. Being non-existant is nothing new to us..just think of what the feeling was like before you was born..you didn't even exist right? You was basically 'dead' in a sense. I believe life has a cycle of rebirth because you gain your conciousness in the form of another human being..or an animal..but you won't remember what happened unless you're hypnotized. Some people get hypnotized and regain memory under hypnosis of their past lives..so personally I think that's exactly what we'll go through. Our SPIRITS, the energy that compells us, it doesn't just die off and become non-existant, but goes through rebirth and lives once again.