Examiner writes: "Do you feel queasy, nauseous or have a massive headache when you play first-person shooter (FPS) games? I get it from playing Halo 3. I know, you're probably thinking that I'm the wussiest gamer on the planet right now. But guess what? What I experienced is a legitimate malady called "simulator sickness" which affects 20% to 50% of the population. It's a type of motion sickness related to virtual environments, simulations, and video games.
Air Force and Navy pilots are even tested for it when they sign up due to the amount of time they'll need to spend in aircraft and combat simulators. Simulator sickness is actually more common in people who do NOT get motion sickness from other things. In fact, if you get motion sickness from cars, boats or planes, you can be pretty sure you won't get simulator sickness."