This case only works in Sports betting. In order types of casino games like slots it doesn't really work. Because you do not need any sort of strategy you just play and win or lose and go home. Specifically it works for skill based gambling games. As for luck based gambling games, if you are winning or losing, it doesn't matter you will sleep well 
It is not compulsory that you watch the games you bet on. You can just place bets and go to sleep the results will be ascertained after you wake up. Except you have the intention to cash out or you want to follow up on the games, sports betting doesn't need close supervision, which deprives one of sleep. In my own view, casino games could keep me awake longer than sports betting.