An dER Uni, Alter. Das sollte im Dativ sein. ;)
I think that my dreams are currently in the 3 languages I can use (close to) fluently but I usually don't realize this. I dream the meaning - not the words.
And when we talk, rarely do I account for the language we are using since we sometimes switch in the middle of the sentence when a non-Bulgarian comes or leaves. I recently had to explain in court (long story) in what language I had conducted a conversation a year ago and the judge had problems with grasping the idea that I really don't know. I was just preparing to make a sentence starting in English, continuing in German and ending in Bulgarian as a demonstration but she accepted the explanation that there are 90+ nationalities at my universities.
Anyways, I started "thinking" in English in 2nd grade. I had been learning the language for a bit more than a year and I don't think that I knew a lot more than 100 words, such as "a kite" and "a ball". But when you start learning a new language, your brain finds it entertaining to just play with this language and exercise it as soon as a certain point of understanding has been reached. :)