It's funny you mentioned working-from-home companies, because that's exactly how I deal with this problem. :) And it's something everyone should ask about at an interview; these days, a company had better cough up a VPN to hire me.
It's simple: I know that I'll think of something at midnight on a Wednesday, and want to log in to flush it out (or sometimes, when I wake up on Sunday). So I work at home at least half the time; and if I'm feeling even slightly lacking in energy, I don't even bother logging in. I know that eventually the drive will return (probably later that afternoon or evening). I have a cell phone, I check E-mail and office voice mail now and then. And I've been finishing at least as much every week as I did years ago when I was in the office all day long, except I'm a lot happier.