What if

What if the light when you die is actually the light of the hospital you are born in and you cry when you are born because you just died. Dejavu is because of events which happened in your other life. The reason you can't remember many things from when you are younger is because your brain doesn't know which memories are from the previous life or current life and therefore doesn't know which memories to remove. Dreams are pieces of your future life mixed together. Think about that for a moment.