Sweatpants - at least a certain kind - are a great solution to the first decision of the day: what to wear. Nike makes them without elastic at the bottom, which makes them look more like pants and less like you're on the way to workout. And with the deep side pockets, back pocket with velcro, and the heavyweight fabric you just look like you're wearing COMFORTABLE pants.
They're also a good solution for your mood, because who doesn't feel better wearing sweats?