This doesn't only happens to a person who is winning, it also happens to a losing person. Meaning that if often happens in two ways, when we are on a wining strick, we often feel like wanting to win more out of greediness and this make us not to sleep just to make sure we keep winning. In other hands when we are losing we often can't sleep because the urge to chase our loses will eventually cloud our sens of reasoning making us to sleep just to recoup our loses. But immediately after everything ends or whenever bankroll becomes empty then the adrenaline that drives that force will chill off because there is noore driving Force.