Replying to Talking to friend in her sleep...

Alright so I have this friend named Sam and she sleep talks, but not only does she sleep talk you can hold a conversation with her while she is asleep. Last week we went on a trip from PA to mississippi, so the car ride was damn long. whenever she falls asleep and starts having a dream, she starts talking about it and we can then start talking back to her. its so weird because she claims to only remember up to where the dream stopped when we started talkign to her and then it goes blank. one time we even got her to cry by telling her that her sister was eaten by a monkey who had a peanut (no joke, she is allergic to peanuts so she couldnt save her sister) well on the trip she fell asleep numerous times. she will sing for us, tell us stories, and even tell us stuff about her and her boyfriend that she sure as hell would never tell us awake. it is so weird and i was wondering if anyone else on NS knows someone who does this. oh we also have videos of her singing peanut butter jelly time that i think will be uploaded to youtube soon enough and if they do ill post it on here.