I think the key here is the low quality work at the end of the day. I often knock off when I detect that I'm running at a very low productivity rate. Invariab

I think the key here is the low quality work at the end of the day. I often knock off when I detect that I'm running at a very low productivity rate. Invariably the next day the overwhelming and seemingly massive task from the night before takes just a few minutes for the well rested brain. There's also something about the "self control as a finite resource" that comes in to play here.