I've been a segmented sleeper my whole life, and there are a few things I do differently than most people. For one, I've never had much tolerance for heavy curtains and unnaturally dark rooms. I have "light-filtering" mini blinds and sheer curtains that give me privacy, but don't block much light. While it was never a conscious choice, I feel like the natural light has done a lot to keep my circadian rhythms tuned to a more evolutionary normal.
Another thing is that I don't fight it. I go to bed when I'm sleepy. When I wake up in the middle of the night I don't panic - I know I'll be comfortably out again in a couple of hours and I'm not going to wake up tired. I spend my wakeful time doing relaxing, pleasant things.
To give you an idea of my regular sleep schedule, I'm typically ready to zonk out by 10, and I'm asleep within just a few minutes of my head hitting the pillow. I usually wake up from my first sleep around 2, get up, go to the bathroom, maybe have a glass of water or an apple, and settle back into bed to read a book, check the news, or just relax and think about my day. Second sleep usually comes around 3 or 4 (recognize when you get sleepy again and don't fight it), and from there I sleep until around 7. I'm never tired, even when getting less than 8 hours of sleep. It's really all about listening to your body and trusting it to do what it needs.