I tried polyphasic sleep a couple of times this past spring. Both times I made it for two weeks without any excessive oversleeping, but I found that I had to do so much driving while sleepy (I had to commute two hours to Boston thrice a week) that it was freaking me out. Also, I was always way too drowsy when my wife wanted to do... um... intimate things.
However, now back to monophasic, I am finding that I never get enough sleep to feel truly rested. I think I may be sleeping too much, or at the wrong times, or something. I'm curious about free-running sleep -- while my schedule is tight, there are flexible aspects to it and I may be able to make it work. Can you point me to any resources?