>I'm not being facetious, but this might be a personal problem (not being able to get your mind off of work). For people who experience this, something like meditation might help, seriously. I certainly wouldn't fault an employer.
It's not that most people can't take their mind off of work, it's that they often have to meet various unrealistic deadlines, or else. It's not their own choice, insofar as they want to keep their job.