So this intuitively appeals to me. The fact that we wake up when our bodies tell us too rather than artificially. And fortunately I can pretty much set my own hours so it's not a big deal. But here's the problem...
Ideally I'd love to get up early every day (around 6 AM) and that also seems natural (given when it's sunny out and how we'd behave in the absence of artificial light). However, I find that I get so excited about what I'm doing that I often stay up late at night. Free running sleep to me means go to bed when you are tired right? So if I'm not tired then I stay up and can't get up early in the morning.
So I guess I'm trying to find the balance between two seemingly natural things: waking up and going to sleep when your body tells you vs. spending most of your sleep time in the dark and all of your waking hours in the light.