When your cerebellum takes over the simple tasks, it then frees up cerebrum for the much harder tasks.
That's why when you sleep, sheit, shave or shower you come up with the most brilliant ideas
At least, that's what Sheldon said in an episode of The Big Bang Theory when he was doing what Penny does, to free up his mind. I may have misquoted him
"It's a wave!"
"The time to applaud would be now!"
Ok, me a geek,.. I confess,..