Not only are you not your job, your job is not worth taking home with you; unless it's actually your company, leave it in the office. You can love your job and still have days when you hate it, or days when you'd rather be doing anything else; that doesn't mean you don't still like what you do.

As a profession we can all be obsessive and not take the time out that we need, so make special effort to do so, even if that just means you're working on a personal project instead. Your brain, and partner, will be glad that you did. Whether you like to admit it or not, everyone needs downtime.