I check mine daily, repeatedly through the day.
Well, when it's going up. If I look at it in the morning, and it's having a bad day, I shut it down and turn my attention to something else. If we're going through a bad period (like in 2008), I stopped looking at it for a few months, and turned my attention to other interests. I knew it would be a horrible idea to sell and lock in losses (well over 50% at the time), so I just held on and waited to see what would happen.
What did happen is a monumental leapfrog over where I was then. It took a while, but that's what happened.
I'm the same way with sports. If my team sucks, I don't watch very much. If they're doing well, I tune in more often. I try and focus on positive things, I guess.