On the intarweb: Slacker or sick?
http://www.medicalnewstoday.com/medicalnews.php?newsid=32560

This is interesting: repetitive stress injuries (you know, the injuries we get from boring routinary things, like when working on a computer) apprently triggers what the researchers called "sick worker syndrome", characterized by fatigue and depression.

According to the article, while the research initially went on to have fairly predictable results, there was also one unexpected observation based from the experiments conducted on the rats: that increasing levels of stress brought about by low-level repetitive tasks also affected the rats psychosocial performance--they started taking things easier by slacking off.