Earlier quoted context omitted.
There is a science component to ideas in the shower. I read somewhere that the shower puts you into a similar state to the waking/sleeping transition that people like Einstein tried to ride by sitting and holding something heavy and loud, so if the slipped too far towards sleep they'd drop it and wake themselves up. I don't have any references to where I heard that though. Similar lines, I read about some earlish com…
I think I've heard the same story about sleeping with a ball, but with Edison.
(or maybe they all did it)