A very intriguing question. I have a bipolar diagnosis. One of the symptoms is psychosis - big definition for that no time or space. One form of that is derealization or inability to connect with reality or reality seems unreal. It mixes with depersonalization sometimes too. Or, separation from self. It is a feeling of watching oneself act, while having no control over a situation.
I like to say I am living the dream, yet it is really just that. What is that new TV show about the detective trying to solve his son's murder and doesn't know if he is in the dream or not. http://hubpages.com/entertainment/Awake-TV-Show-Re... was written by Lauryallan here at hubpages about this unique phenomena.
I haven't seen it yet, but sounds familiar to me, anyway.