Over the holiday break, I managed to get myself on the polyphasic sleep. In fact, I don't think I will ever go back! I used to have problems with sleeping too long and would end up sleeping 8-12 houra a day.
Ironically, I didn't have a problem adjusting. I do computer work, so sometimes I have to work at 2 AM to perform maintenance during low activity times.
There is one thing I do differently from what others have posted. I made my own CD which induces deep sleep. I listen to it during the 30 minute naps. I made it using Brainwave Generator at www.bwgen.com.
I play 20 minute of deep theta tones and then play "10-Minute Supercharger". I suppose you can use "Deep Relaxtion" paraliminal as well, in place of my theta sleep.
Here are some other things I learned as well:
1. You got to exercise. The better shape you are in the better quality sleep you get. I usually do 30 minutes a day on my rebounder when I get up.
2. You got to eat healthy. No more candy, junk food, soda, alcohol, or caffeniated beverages. I find I can't stick to the sleep schedule if I consume these types of food. The more junk I eat, the harder it is.
3. Drink plenty of water. Keeping yourself hydrated is important.
4. Learn to meditate. This helps immensely during those 30 minute naps. You can relax your mind and immediately go into a deep sleep.
Hope this helps.