Writing + Motherhood = The Definition of Murphy's Law

I've been a mom for 7 months now, but it took me WAY less time than that to figure out that motherhood means never doing what you want, when you want to do it.

I swear to you all, my son has radar. He'll be happy and playful and contentedly amusing himself, until the second I decide there's something I need to get done - namely eating or writing. Then all of a sudden he goes from this:

To this:

I've also noticed this particular brand of Murphy's Law applies to his sleep patterns. When I'm bursting with a new scene to write, or dying to finish up an old one, I can almost guarantee this will happen:

But when I'm absolutely stuck, and couldn't get words down even if you bribed me with a night with Colton Haynes, that's when he does this for hours on end:

What about you, peeps? What are your hindrances to writing? When do you sneak in your creative moments?