Consciousness is still a mystery...<quoted text>
You can also see things in a coma, but more than not when you awaken the memory is altered because the sensory data could not be recorded perfectly. So often people will remember them as out of body dreams, or often even complete dreams, fantasy mixed in with the sensory memories to fill in the gaps.
http://www.thefreelibrary.com/Consciousness%3... 's+biggest+mystery%3A+the+ques t+to+understand...-a0174817872
...even to those who consider themselves experts on the subject.