I definitely get worn out. That's why I can only play videogames for an hour at a time (max) before having to save and do something else. A lot of people think it's just that I'm not as "hardcore" about videogames as they are, but it's a pretty serious issue. I can't play more than an hour before I start feeling mentally exhausted. I can come back in 15 or 20 minutes though. They say for every hour of studying you should take a 15 minute break. Sounds about right