I don't understand what any of you are saying about getting literally tired from playing video games. I can play a game all day, go to sleep, wake up, play it all day again and so on and never be physically or mentally weary. Of course, I get sleepy but being tired is different from being sleepy and I only get sleepy in the sense that I've been awake all day and need sleep.
I mean, I can get bored of a game or bored of playing games in general but that's totally different from getting tired. My wife and brother are the same way and so are a bunch of our gamer friends, so it's not just me.
If anything, playing video games for extended periods of time makes me feel better, actually.