I think some may call this a dual consciousness however it is usually through Astral projection and being awake at the sametime. I have never exprience this phenomenon but I do find it to be interesting. The ancient egyptian scriptures talk about dual consciousness about being awake in different types of Reality. Ofcourse logically this will be hard to explain, prehaps it could be a process of timing how you wake up from a dream to waking life. If you were able to cause it again then I guess we would all have a new exprience to talk about and learn. Now people will never be killed in their sleep and will still be refresh for work while watching tv or studying.