Working on Sunday

I am always more productive when I work on Sundays. Why? I used to think it was the lack of distractions, and that is certainly part of the answer, but I think it has more to do with a mindset: "I'm here to work." I guess if I come in to work on a Sunday I feel obligated to make it worthwhile. I also feel like any work I do get done is a "bonus," work I hadn't planned on finishing. When I come to work on Sunday, I generally have a specific task that I want to accomplish as well, so I am focused on just one thing, not a million little tasks. Why doesn't that happen on a regular workday? Got me, but I've decided I'm better off to take a day off during the week and come in on Sunday than to work a straight week. Works for me.