When I regularly work from home, I work more from lack of friction than poor work life balance. Commuting to the office causes friction. Getting up, walking to the bathroom, the kitchen (all of which are a lot farther away in my office) all cause friction. Dealing with noise, making sure I lock my computer, mute my music and generally act like a considerate coworker all cause friction. All of those things go away when I work from home. I crank up my stereo and pace around my home without worrying about bothering anyone.

I work more hours and am less tired (I my mind, that's the key - I'm less fatigued at home) because I'm not constantly dealing with interruptions, context switches, and noise.