I remember when played a lot of DotA 2, trying to climb the ranks. < 6.5 hours of sleep == significantly more bad plays I wouldn't have made otherwise: forgetting about some important aspect, mistiming an action or reacting too slow. It was a level where I was often matched with competitive players and one mistake often changed the result of the game. In hindsight, I would've been better off just stopping for the day the moment I noticed my performance is garbage, but well, the game was addictive. It was almost always a bad decision to keep playing, but again, I was prone to making bad decisions on such days.
