[tzs]

One thing I've found that greatly helps me keep work and non-work separated when working at home is to dress like I'm going to the office.

Normally at home I either go barefoot (during warmer weather) or just wear socks (during colder weather). When working at home, I put on shoes and that makes it feel sufficiently different than normal home time that I have no trouble getting into and staying in work mode. When I'm done for the day, I kick off the shoes and it feels just like I returned home from a day away.