The wonder of technology!
My new employers are technology people. As a result, we've got emails going back and forth on a regular basis (and at late hours, too). We've got multiple laptops available for use in the one location. We've got a great remote email server.
So, here I sit at 12 midnight and I can be on top of what is going on at work, without being there. Okay, I know full well that in six months I'll probably curse the people who've brought us to this level of communication, but right now, it's rather cool!