I don't have to. I have a wife, two kids, and a half done house that does it for me.
Seriously, when I come home from work, or I stop working when I work from home, my family quickly turns my brain off. We do stuff together, so I can't really think about work, even if I want/have to.
In the rare cases they are not at home, I fix something on the house. We bought it a year ago, but I think it will provide me with work for at least 7 more years.