My Dad is straight up the biggest work-a-holic I've ever met. Constantly works 12-16 hour days, weekends, etc. Says he loves it. Came out of retirement to work more. I don't understand it but he's happy.

I got some of my friends jobs at work through him and it got brought up to me that he fell asleep at work quite a lot. Was hard to hide because he snored really loud. Was pretty embarrassing to me. Either way, long story short, he had exactly what the other poster was talking about sleep apnea. Got diagnosed, got a c-pap(?) device and guess what, no more falling asleep at work. Probably saved his life as well, as he's already had a heart surgery.

Either way, I pretty sure he's the most non-lazy person I've ever been around. :)