Yes, this happens in my brain all the time, used to it, but, sometimes sort of not. I can't really control it, it pretty much limits the duration & kind of work I can do, but it comes in handy when doing my weird fantasy drawings. My brain just goes on and on making connections all over the place, which lead to visual ideas, which I then draw. That's fun.
If only I could find information which I know is in there somewhere, when I need it or want it, but it never seems to work that way. It especially bothered my kids if I let it become something I said out loud, especially if I was (supposed to be focused) helping with homework.