I work nights as well. My normal work hours are 5pm to 6am. I have to be there an hour earlier before every one else since I run a crew. I work a rotating schedule though, 2 on 2 off, 3 on 2 off, 2 on 3 off, it's a normal rotation like that every two weeks. To top it off I'm also an insomniac. I've worked nights for a long time though, before this job I was an EMT and worked twleve hour shifts with a call shift behind my night shifts. Worked 3 on and 4 off. It's definately a life style.
When I was working on the ambulance I learned how to sleep literally any where. I also learned the joys of the "combat nap", grabbing a few minutes whenever I could. You had to to cope with the long and irregular hours.
Now that I work "regular hours", I still take combat naps. That's mostly because of my insomnia though. I consider 4 uninterrupted hours of sleep an oasis.
To some degree it affects my hunting, I have more time to hunt than the average person. But because of my awful sleep habits I find that I often have to hunt tired. Sometimes when I go to the woods I actually look forward to taking a nap at the base of a tree, it's very peaceful and all the stress and cares of the outside world really seem to melt away. To me it's still been a good trip and I don't usually sleep more than an hour or so. I'm out there for me any way, the focus of my hunting often changes when I get to the woods.