I have heard of interpreting symbols, things or people who appear in a dream like Eliyahu. I have also - in regards to sleep - heard of Rabbonim who could recite or review Torah in their sleep. In a shiur, I learned that in inquiring of the future, drunks and (sleeping) children can provide insight, though not something to rely on. But are there sources explaining sleep talking/walking?
The question is of particular interest because I have sometimes "severe" (aka hilarious) episodes of sleep talking or walking.