Sleeptalker
Someone you can hold a conversation with while they are legitimately asleep. Useful when said sleeptalker has information that you would like to know.
Girl 1 : "Oh my god, you were totally right about my BF, he is cheating on me!"
Girl 2 : "No way! How did you find out?"
Girl 1 : "He's a sleeptalker, he started talking in his sleep last night, then I replied to something he said and he answered! I looked to see if he was really asleep, and he was! The next time he began talking, I started asking him questions, and he answered everything."
Girl 2 : "No way! How did you find out?"
Girl 1 : "He's a sleeptalker, he started talking in his sleep last night, then I replied to something he said and he answered! I looked to see if he was really asleep, and he was! The next time he began talking, I started asking him questions, and he answered everything."