Well, I don't know about this in gambling but in sport betting, I can agree that some people are so caught up with their bets that if they bet on a parlay, let's say it's a combination of 10 games which is supposed to run for 5 days or more, as the game continues to play out in their favour, some person will not find it easy to sleep because all their mind will be tied to that game and they will even be day dreaming about winning all the game and having a big cash out. In casino games, you don't have any outstanding outcomes, your results are instant, so why can't the gambler sleep?