Apparently, playing Nintendo's new 3DS handheld for an extended period can give you a headache. Don't worry! Nintendo has a solution: stop playing the Nintendo 3DS so much.
Yes, the solution is as simple as just taking a break when you get a headache. Which is a perfectly reasonable solution, but also one that sort of confirms the fact that playing Nintendo's glasses-free 3D handheld will give you a headache. I prefer my gaming to be headache-free, thanks, so I can play for 12 straight hours without moving. You know, the way games are meant to be played.