When my wife was my girlfriend, she would sleepwalk and sleeptalk like crazy if she had Robitussin before going to bed. It was so hilarious, we could actually interact with her dream. She would be walking around and everything. I even brought one of my other friends over one night because I didn't think anyone would beleive me the extent we were interacting with her when she was asleep.
One of the active ingredients in Robitussin is
Dextromethorphan which apparently is a psychadelic drug!