I think I burned myself out about a month ago finishing some testing that got way behind due to design and equipment problems, so I'm just taking it easy now. Been leaving work around 4:40p.m. a few days a week, although I come in around 7:15a.m. (and don't start working until 8a.m. after I've finished reading the news and waking up, but it's not like anybody would ever know.) Not feeling productive at all, but the work is still getting done. When I'm really into my work I can spend all day doing it without any breaks.
The absolute worst is when I'm finally able to focus for more than 15 minutes and I'm bothered by dumb questions by the same people who can't seem to just send an e-mail. Certain management pushes the "go talk to somebody rather than send an e-mail" mentality. Always takes a few minutes to regain my composure, but sometimes they walk back with a "oh, I forgot, I have another question..." That's when I feel like smashing my head into my desk would be better than giving them an answer.
After nine years, it might be time for a change of pace. I think I'm ripe for a management position.