This is common, I think, or at least I've seen other people discuss it before ( http://adamcadre.livejournal.com/172934.html ), and it fits my own experience as well. From which I had the rather obvious-in-hindsight insight that the experience of knowledge is itself just another sort of experience, just another type of qualia, just like color or sound.

In dreams knowledge doesn't need to have an origin-via-discovery, same way that dream images don't need to originate in our eyes, and dream sounds don't need to originate in vibrations of our ear drums...