There is a natural disorder that causes sleep walking in which the muscle paralysis system fails and you act out your dreams. If you know your house well, it is very well possible that you could walk through your house in a dream and at the same time be doing it in real life, then suddenly wake up being somewhere... It is even possible to sleep walk with your eyes wide open and still be seeing nonphysical imagery. I can link you if you are interested in more information on this.