Vicious, or perhaps stupid, cycle

I'm wrapping up a game spec for Unplugged, Inc. It's a pretty simple game, but I want it to have some subtle behaviors. So I'm putting a fair amount of work into getting the algorithms just right. Which takes time. Which makes me tired. Which makes me work more slowly. Which makes it later.

So now I'm going to bed. Because, if I had gone to bed two hours ago, it wouldn't have been nearly as stupid.