Blink. :) It's silly, but it's really easy to stare at the screen for long periods of time, especially when reading. Catch yourself doing this, and force your

Blink. :) It's silly, but it's really easy to stare at the screen for long periods of time, especially when reading. Catch yourself doing this, and force yourself to blink more often. Instead of just turning away to adjust your eyes, do your whole body a favor: stand up and walk away. Go find a drink, and in the process look around to rest your eyes. If you drink a lot, you'll naturally want to walk away from time to time. :)