Paper Biscuit on the brain
Cintiq drawing on Photoshop. Sigh
When the moment is upon you to draw, you draw.
I've learned to recognize the feeling and the only choices left to me are: do I stop everything and just draw? Or let the moment go and be fine with it? Once the moment recedes into time you can't recover it. Even if you have a pretty good idea of what it is, the drawing that would have happened at that very moment would be different from the drawing you try just an hour later or worse a day later.
I've had moments when I drive home and get story ideas, solutions that I really like and rush through the doors of my home and hope that I can keep this mental picture/feeling of what it is and try to jot it down, draw it--but it mostly melts into thin air. Just saying, Hello, honey I'm home! would dislodge it, dropping the bags to run to the computer can dissipate it.
So, when I'm relatively able to draw or write, I do it. Or forever hold my peace. There'll be another time. Just forget it. It'll be better next time.