I think its a mental fantasy.
In the attached video above, Dr Moody tells a story about a surgeon who was unable to resuscitate a patient. After the patient's wife stormed into the OR yelling at him that her husband told her he wasn't dead, he resumed resuscitation and revived him. Later in recovery, the moment the husband woke up, he told the surgeon that he tried to tell him that he wasn't dead, but because the surgeon wasn't responding to him, he went out into the lobby to tell his wife. Dr Moody tells the story a little better and offers some other details in the video, but in any case, what do you make of this?