I believe that sleeps helps us recuperate. While we are sleeping the body repairs its self and repairs any damaged brain tissue. It also changes its structures. The brain uses this time as a way for someone to heal from the mental strain that it had to go through the day. It makes sense tht the brain would need a break and need a certain time during a 24 hour period for its matinance. It would be a difficult to try and repair the brain while trying to concentrate on let's say, doing notes and remembering them.

While I have herd stories from my famly and friends of their experiences with the ghosts, I am simply not convinced they are real. I understand that some people do have encounters with them and at times there seems to be other explanaiton. I believe that could be a posiblity that they are real. I myself have seen wonders in this world and know that nything is possible, however since I myself have never had an experience have never done research as to weather or not they are real I will not say they are real.