Polyphasic Sleep (2-4 hrs/day by napping)

You basically take 15-30 minute naps every 4-6 hours around the clock.  Optionally, you can also sleep 2-3 hours once a day in addition to the naps.  I've been doing this for a week and feel alert most of the time..  is it healthy to carry this out in the long run?

http://en.wikipedia.org/wiki/Polyphasic_sleep

30 min nap? Does that include the time you take to fall asleep, then the time you take to get up (assuming you don't oversleep)? Sounds like it's not worth it.