I know this is going to sound nutty but there actually is a lot of research that links motivation with appearance. People who feel better about they way they look on the outside tend to do get more done. I can personally attest to this.
Very rarely I will have a day in "mom uniform"--yoga pants, slipper socks, random long-sleeve T-shirt with toothpaste drip on the front and Pax snot on the arm and hair in a ponytail. Sounds hot. Am I comfy? You bet. Do I ever get anything done on these days? Nope.
I've found that when I get up and get ready--head to toe--I'm always ready to tackle the day. So if you have a day coming up where you need to clean and cook, and run errands, and make calls and take treats to your kid's class and and and ... get up and get dressed.
Head to toe.
(Hopefully you realize that by posting this I just became enemy #1 to velour jumpsuit wearers and feminists world wide. This is the sacrifice I'm willing to make for my loyal blog-buddies!)