If this is true, I'm in big trouble:
One of the things we’ve been studying the last year or two is mind-wandering - how happy people are when their minds wander away from the task they’re doing in the middle of the day. First of all, we found about half the time people’s minds are wandering. We also found we are happiest when we are thinking about what we are doing - almost regardless of what we are doing. Our studies suggest that having your mind wander is never good, never makes you more happy than you already are.
My mind is almost always wandering. One of the few times it isn't is when I'm actually performing. Then I'm thinking about only what I'm doing. Maybe that's why I like it. I should probably cultivate greater focus.