Its interesting to see your responses. From yours Alma I can say perhaps we are influenced by the envirnoment we are in?
English,Danish,German, French... :-)
O and by the way in dreams you are fluent in any language you want, it is a dream after all and in dreams anything is possible. You can also do impossible things like walk on water, fly or become a superhero. :-)
I have heard that we dream in the languages we are fluent in. I am not fluent in Spanish, but when I have spent a lot of time with Spanish speakers I dream in that language also. So, I think it has to do with the languages we know, which of course include the mother tongue.
I think I dream in Arabic and English. Mother tonge is Arabic. But I am most comfortable speaking Arabic/English at the same time. What some call "Arabeezy"!