I put this great little freeware program on my computer. It's called Time Out (4 "mice" from Macworld magazine), and basically what it does is "freeze" your computer for 15 seconds every 10 minutes, and then 10 minutes every hour, so you "have" to take a break (although it does allow you to override). If you spend a lot of time on your computer, it's good to have something like this to make sure you stretch your arms, look away from the screen, etc. If you're on the computer a lot at home, it's imperative to have something like this on your computer, otherwise the sheer amazing vastness of the Internet (and the complexity of, in my case, trying to code some CSS/HTML) will suck you away from your loved ones . . . This is a Mac program but I'm sure you can find a similar Windows program easily, search for "windows break reminder software" or something like that.