"Life" after death exists, just not the same life.
Atoms contain energy. Such energy combined with other atoms's energy creates more energy, and also creates diferent kinds of energy. Electrical energy, gravity/magnet's energy, and many many more kinds. When anything decomposes, whether a living being or not, it's atoms get mixed with all other atoms that surround them, either by simply being reduced to cells and then to loose atoms that imediately connect to adjacent atoms, or by any other means like serving as food for worms.
All those atoms that got scattered will create certain combinations of energy with all the atoms that they connected with and thus allowing the creation of something new. I believe that only living beings can create other living beings by procreation and I believe the only living beings that can get created spontaneously are, in example, fungus, algae, and many micro organisms and unicelular beings. The latest ones can most surely evolve into more complex beings over long periods of time. That is according to science theories and seems logic if you look at how they grow.
As for the awareness after life, I fear it's most impossible. When you get decomposed, your brain gets too, and all it's atoms get scattered aswell. Thus the attoms from your brain would be most likely contained in more that just few new life forms, if they would even be contained in life forms. And even if they still kept the electrical energy that had in their previous life form, I doubt it would be enough to bring back any memories. Plus, they had to be again part of a brain to that end. Remember, it can take just a tiny portion of your brain to be damaged for you to get fully disfunctional. So I really doubt that an atomic-sized piece of brain would ever be able to keep any memory with it. This makes me totaly skeptic about hypnotic regression. I fear that people who went through it, saw nothing more than what they see in their dreams every night while their brain isn't fully functional. Even though it may be good therapy.
And by the way, Science doesn't give facts, it gives theories. The only kind of Science that gives you facts is Mathematics.
Don't argue about if Science is or not exact. It's mostly based upon theories and scientists never claimed otherwise. But remember to look around you and behold all the things you have that would have never been made without such theories. If a certain theory would be wrong, would you be looking at my post through your monitor, for example? Would you have Toy Laser Beams, micro-waves, TV, CD's, Automobiles, (safe) airplanes, weather forecast, astronomic knowledge, (non) Digital Cameras, satelites, ovens, magnets, lights, .... and millions of things, surelly including all you have in front of you now?
Think about it.
See how a "simple" Toy Laser Beam works, for example:
http :// science.howstuffworks.com/laser4.htm
(Take out the spaces. I'm not allowed to post links yet.)