When you are asleep and are talking do you tell the truth or speak about what you are dreaming?

I had a college roommate who golfed in his sleep one night. He stood at the foot of his bed, swung an imaginary club and jumped up and down saying "hole in one! hole in one!".

He never got a REAL hole in one the entire time I knew him, so he couldn't have been "telling the truth"; he was simply speaking about what he was dreaming.

When my daughter talks in her sleep, I usually cannot understand what she is saying.

However, I do remember one night when she was sleep talking about a green lion on her bedroom ceiling... which, obviously, only existed in her dream.