I'd think that having to urinate could lead to greater short-term focus by increasing the rate at which we're able to draw our willpower reserve. This explains

I'd think that having to urinate could lead to greater short-term focus by increasing the rate at which we're able to draw our willpower reserve. This explains the old "stay hungry" advice given to boxers, for example. I find I can concentrate better when I'm slightly uncomfortable, but I doubt I could maintain that level of concentration for a long period of time.