As someone who both plays videogames and tries to improve with a piano, think there's a key difference: piano exercises me mentally, I know when I get to a point where my head isn't going to get anything out of more practice for a while, and I want to do something else. I go to bed in a similar state like after going to the gym, that is, eager to sleep and rest.

With videogames, the experience usually is very different. I'll blink, and suddenly it's time to go to bed and my whole free time for the day is gone. I don't want to go to bed because my mind is telling me that there's still more day left, no way it's all done already; so I usually go to bed really late.

Days feel far longer when I'm not playing, in a good way. Gaming is like presing the fast forward button on your life.