Not all days are created equal.
Recently I got into the habit of thinking the outcome of my days depended on how Sam slept, whether or not he napped, what time it is when Matt's work day ends and what kind of mood he's in, and finally if I got everything on my list done.
That's not really working for me. I kind of liked it better when the marker of a good day went more like this: Kept the kid alive. Got some stuff done. Went to bed.