when your work is what you love...
Personally I'm someone who can't work for 100 percent, it's impossible for me. Why? Because I always giving even more, I just really like what I'm doing. I always looking for new, better solution, I must improve my skills, increase my knowledge etc. It's just stronger than me.And, as I notice, in IT this is common approach. We, developers, managers, designers, love what we are doing, this is our passion, this is not only 8 hours work, this is something more. We love challenges, we love problems, bugs, because these are the things, which gives us opportunity to test ourselves, to verify our skills and learn something new.
This attitude continues until we're motivated. And here comes the problem...