In recent days my dad has had a bad case of "ICU delirium" in the hospital—by all accounts not an uncommon condition, when someone has been trapped in an unfamiliar setting for days, with irregular sleep and meals, and a rotating cast of faces.
The result, whatever its cause, is that dad's subconscious self is coming out into full view, in the form of hallucinations and misconceptions about his surroundings.
The thing is: it turns out to be practically the same as his fully conscious self.