> The sad part is that no one forces you to work that hard.

Maybe I've been farming for too long, but my brain, at least, is wired to push until completion and until things are done it will consume me. If you're going to be up all night ruminating about it, you may as well actually work on it.

Of course, in farming you get a nice long break after you've pushed yourself hard. I've never worked at Microsoft, but I suspect, given what I've seen elsewhere, that as soon as it is done it's already on to the next thing, never giving workers a chance to stop for a while.