I too have had dreams where I have spoken a language fluently that I only had a small based in (Spanish 2) and when I checked about 3/4 of the thing I said actually made perfect sense. I was naturally astounded by this. Your SC does remember absolutely everything you learn, say, or so in your whole life, plus dreams. I must have been exposed to enough Spanish to the point where my SC could actually make the language fluent for me in some degree.