the science of sleep

sleep is the strangest phenomina.
the subcomscious taking over the conscious or the conscious taking over the subconscious?
we will never know.
to what occurance can we then label things like sleep walking, talking in sleep , doing things that you would not do consciously.
now what do you do when someone is saying something in front of you while they are sleeping, or doing something to you?
do you move away, and in the process wake them up..... let thme wake up in the situation, embarrased?
or let them go ahead whateve they are doing?
do you believe that they are sleeping?
are people unaware of what they do while they sleep? or they just use it as an excuse?... because well lets face it.. sleep is one of the mysteries of the human mind that no one can say they have deciphered. do you trust your heart or your brain or the other person? and let yourself be violated, be revealed secrets to, be talked to, be sung to, be laughed with... there are a billion questions, that need answers. and i have not the slightest idea why im posting them here. hoping from an answer from a lifeless screen? or from myself.
i have not the slightest idea.
what is deja vu all about?
is it that our whole life is pre planned... and comes to us while we are sleeping... and sometimes when we go through the incidents that we saw.. we realise we have gone through them before....
is it that we know what our destiny is?
is it that in the end... no matter how many questions we ask we now what is going to happen in the end?
i have not the slightest idea.