In the early stages of learning something totally new (a new language, etc) I will be completely confounded by something, only to wake up and find that I fully

In the early stages of learning something totally new (a new language, etc) I will be completely confounded by something, only to wake up and find that I fully understand it. It's a spooky feeling because it really doesn't seem like you had the prerequisites for that understanding before you slept (although of course you must have).