Somthing i have been thinking about for a while

The purpose of dreaming: i believe that dreaming has a purpose on which i am going to reflect on in this piece of work.
Dreaming, Dreaming is just somthing the brain makes out of events which have happend to you or you have seen on tv or read. or is it?
as im about to explain i dont believe the previous theory of which i just summerised into one line, in my theory i am going to try and explain what is going on inside my head when i am dreaming. dreaming is not just somthing the mind projects from prevous things that have happend to you or what you have seen in the past it can also be a very physical thing which you can involve your body in such as sleep walking or even sleep talking, which is an occurance while you are dreaming but can these things be a direct link to the way that we as people act or feel? the answer to that question is yes because not everyone experiances these sleep actions which people talk about, i believe it is too do with the mental state of which you end the day in or the state you are in before you go too sleep, or maybe it is an indication of how you are going too feel in the morning.
my mother suffers from sleep talking, you can have a convosation with her whilee she sleeps i believe that when you are asleep another side to your mind becomes appernt one that in most people is berried which is why they just sleep normaly. but people who awaken this 'other side' to there brain, can talk walk and in extreme cases even kill people subconcously, which is a concern which i have because if my theory is correct about people having a different side to them which some people can tap into which we call 'crazy' maybe they are accualy the same ones and we are crazy maybe we are ment to walk and talk while we sleep, and we have too halves to our minds which only a select few can tap into.