The Muse never visits when you're waiting for her. But the very moment you are neck deep in some other project, she'll wander by and whisper something in your ear that has nothing to do with what's at hand. She's a slippery little minx, and a notebook is the only way I've found to keep her whispers for a rainy day.
I keep little notebooks all over the house and one by my bed. So generally, no matter where the hell I am I will be able to sketch things down. I have a mind like a sieve.
i started doing this when i couldn't get any sleep from all the ideas that kept bouncing back and forth this is also a good way of getting rid of anxiety - you write down what is on your mind and it gets out of your head allowing you to get on with more important tasks or getting sleep (in my case).
I need a new notebook..
Precisely one of the reasons I miss my smart phone too )':