Running and exercising is always a great option to get your mind away and even keep it more focused when you are working. I agree some game can be too to some extend, however if I'm stressed about something I want to finish, a game is not gonna distract me. Sometimes when I'm really stressed about work because I have been working non-stop for too many days, I take a night out get myself completely wasted, for regular days a beer or two otherwise can be good too.
I have a routine to watch something before I go to sleep, right now it's family guy, but can be any show that doesn't require me to think a lot and make me relax. This routine puts my brain into a state of knowing it's time to sleep, it's a common psychological trick to have fixed habits to change the state of the brain.