You need to decrease your productivity during the work day. Various strategies are to finish the work day in the early afternoon after lunch, stop once you've solved the problem of the day, go for a walk before knocking off time, things like that. You want to create a barrier between your real life and work life such that problems don't exit the building with you.

I'm a big believer in reducing productivity if you've been at a place for a while, especially if they ain't giving you a pay raise. Missed deadlines and missed meetings start to create a pattern that they can't take you for granted.