i've done polyphasic sleep before and end up in frustration because of my inflexible schedule. I think most people need 6 set of REM so the four 30 min nap would be interesting to watch.
After reading all these posts about sleeping less i got inspired and decided that i'm going to do this no matter what! I'm not sure how is this going to turn out but here's my plan
I will squeeze 5 sets of 20 to 30 min nap (20 min works best for me last time i check) at night in 8 hours time.
scheduled 11, 1, 3, 5, 7
then a nap at 5:30 evening
that way i can keep my schedule and polyphasic at the same time. I plan to dedicate the nights to learning and working on my internet business. When the time is right for me to quit my job i plan to migrate to normal polyphasic or the 4 nap plan. (or maybe if this work out because it might go better with the monophasic sleep the world is in)
Good luck to myself.