Is there anyone out there experienced in Cycadian rhythm imbalance?

I generally run on a 40-hour sleep cycle. Up for roughly 32-35 hours at a time. Sleep the rest of the 40-hour cycle. Don't know if you'd consider that an imbalance though. I also have some experience with polyphasic stuff if you're interested.

I'm talking about light cycles of people who move to and from high and low lattitude areas without help from artificial light.

i'm sure there are