Argh! Quiet, brain!

WHY do I always get plot or worldbuilding ideas in the shower or just before drifting off to sleep?

Either I can't remember them, or don't have time to write them down (such as today, showering before work).

Thank the gods for Audacity, which at least means I can blather away like an idiot for nine minutes and record it.

Gah! The brain, it only wants to tell me stuff at inconvenient times!