What language do you dream in?

I remember being told by someone long ago that when you dream in your second (same could go for third or fourth) language that you have made it. Meaning you are fluent. I loved hearing that. I actually thought it was fascinating since I've been obsessed with languages for years, and that includes sign language. I've known since I was in high school that I'd be involved with foreign languages somehow in my life because I can say for sure that that and culture have long been interests of mine, hence my double major in college - Anthropology and Spanish. For years I'd wanted to know more about exchange students and when I was in 11th grade I jumped on the chance to apply to be one and adventure off to the unknown once I had graduated from high school.


I can't recall the first dream that I had in Spanish, but I know it was after I'd been living in Bolivia for some time. I imagine that it was after at least 6 months of being there. It makes sense. I spoke a lot of Spanish throughout the day - to my host families, friends, boyfriend, taxi drivers, store owners, etc. I don't remember that first dream being completely in Spanish, but I know that I was speaking Spanish as I dreamt. Once I woke up and realized what I'd done, I felt exhilarated. I had accomplished what only bilingual people do. Correct? At least I felt I could brag to people that I had dreamt in a foreign language.


Fast forward a number of years and I can say with assurance that I have dreamt in Portuguese as well. I know that I dreamt in the language while I was in Brazil and that I don't do so regularly. I mean, English is my native language and I didn't dream in a second language until I was 18 years old (while in Bolivia) so it's not a daily occurrence or anything, but it happens. Additionally, I often think and talk to myself in Portuguese. I catch myself doing this when I'm thinking about something that I want to say to my husband and I talk to my cat in both languages; I believe that comes from the fact that I'm constantly speaking Portuguese to E, so why not to the cat or to myself? It's a habit.


I remember once having a bad dream, not too long ago, that was in English. In this dream, someone was either going to hurt or kill me and I was scared, but all of a sudden E appeared and saved me. Once he entered into my dream I looked at him and spoke to him in Portuguese, thanking him of course. Once I was finished addressing him I reverted back to speaking/thinking/dreaming in English. Interesting, isn't it? It's like since I normally speak Portuguese with E on a daily basis, that transferred over to my dream and I interrupted my English language dreaming in order to respond to E's saving me, at which time I spoke Portuguese. When I turned back to speak to the other person in my dream, I must have assumed that he was an English language speaker like myself. 


For a multilingual, pseudo Anthropologist as myself this is all so interesting. I like to "study" my own language acquisition and learn from myself. I believe that it helps make me a better language teacher. I also observe my husband and those around me.


My questions now are....what language do you dream in? Do you have bilingual dreams? Does the language you're speaking in your dream change depending on who you're "talking" to (like me)? Do you speak your second/third/fourth language fluently when you dream?