This article talks about the health problems relating to as they say "geek lifestyle." It mostly targets the programmers, but can be applied to almost anyone who uses computers extensively. Although I don't share all those symptoms, horrible sleep hygene and sometimes pain in the back definately apply to me! Anyways here's the article, see what you guys think:
Health Problems Related to the Geek Lifestyle
There is also another link off of that article that talks about extensive keyboard usage and carpal tunnel.
Does Computer Use Cause Carpal Tunnel?