Dymaxion SleepThe term "Dymaxion" means pertaining to Mr. Buckminster Fuller's concept of using technology and resources to their maximum capacity with as little use of resources as possible. It was first used in a published work in 1973 in the book The Dymaxion World of Buckminster Fuller. The title and the fact that the word was used again in 1974 in the book Buckminster Fuller; at home in the universe, lend to the idea that the term had indeed been used unoficially before that. For those of you that don't know, Buckminster Fuller was a very interesting and unusual man.
The reason the following sleep pattern is known as Dymaxion sleep is because it was a pattern supposedly invented by Mr. Fuller and then used himself for the remainder of his life. Like many of his ideas, people of the time were uh, skeptical, at best. Also as many other of his ideas, we are only now starting to realize how truely amazing and revolutionary they were. As a side note, the fact that he was on his sleep schedule until well into his 70s and went on to live to be almost 88 causes many people to disagree with the theory or belief that many sleep experts have that polyphasic sleep will shorten one's life expectency.
What is it?
The Dymaxion sleep schedule consists of four 30 minute naps a day, each 6 hours apart, usually on or around the 6 hour mark. So, 6am, 12pm, 6pm, and 12am naps all of about 30 minutes in length are all the sleep one gets. Of course, this is consistent with the general concepts of Polyphasic Sleep.
Obviously, this results in a total of 2 hours of nap time, the same amount received in an Uberman sleep schedule. It appears that the body just needs an absolute minimum of 2 hours of sleep every day. During Mr. Fuller's life, scientists found that others had issues following his sleep schedule. Many now believe that (a) the 6 hours inbetween is a little more difficult to get adapted to, and (b) the 30 minute nap is a bigger adjustment. See the Article on the optimal length of power naps for more information on this.