After playing video games for a long time why do i start to sweat?

Sweating : Maybe you're playing very vigorously? Most people when they get very involved in an activity, even when they're sitting at a desktop, break out in a sweat. It probably involves the autonomic nervous system if they are sitting down, like when you were taking a big exam or were nervous on a big date. But playing a game, it's how your body cools off, nature's own air conditioner.