I’ve spoken different languages in my dreams. Seriously. Strange experience.
A coworker who speaks nothing but English was staying with some friends who overheard her talking in her sleep. She was speaking German. One of those who overheard her was fluent in German and said that to the best of her understanding the sleep-talker was a Luftwaffe pilot radioing that he was in trouble. Now, that's strange.
I think I may have done that as well though I don’t recall any of it. My wife says I have talked in my sleep in a foreign language. Another time she said I talked in a deep southern accent about a “yankee patrol over yonder”. It’s wierd.