That was interesting.

In my dream last night, I looked up an unfamiliar word in the dictionary, and the definition therein turned out to be the actual definition of the word.

I'm fascinated by this because I didn't know the word at all until I discovered the information, at which point I was flooded with understanding. But clearly I already knew it, because the only resource I used was my own brain. I literally opened a book inside my head that contained things I know but have forgotten. It makes me wonder what else I know that I don't know that I know.

PS the word was "prosody."