This has been bothering me for a while. I usually have very healthy sleeping habbits (between 7 and 9 hours every nights), yet whenever I play games for an hour or more (most I can play in a session is three hours), I end up feeling my brain pulsing on my skull. Add to this a very strong feeling of sleepiness and inability to concentrate.
I've read that some people recommend walking and taking a break from the computer. I tried that, but I end up even more sleepy and bored - and if the exercise is too hard, like running with an eliptic, I end-up with a massive headache.
I drink quite a bit of water (I had issues because of that when I was younger). I'm guilty of taking cups of coffee (the issue was there way before - and somehow, coffee doesn't help me stay awake when I get fatigued) and one small coca-cola can (the slim version that's roughly half of a normal can) per day, but other than that I have healthy food habbits considering all of my allergies. I also take vitamins every day as recommended by my doctor.
So I don't get it. Some of my friends can play for hours and they don't get dizzy in the slighest. Am I the only one feeling this way or is it more common that I think?