I was really, REALLY interested in polyphasic sleep for a while, but I don't think there's enough research to support this. Stampi's experiments have never been reproduced and the scientific community appears to have no interest in them. Also, I'm pretty sure that Leo's use of this was hearsay, as was Napoleon's and Buckminster Fuller's -- at least, I have yet to see any credible sources.
The big trend toward polyphasic sleep began with a post about the so-called "Uberman's Sleep Schedule" on Everything2; a later article on kuro5hin helped popularize it more.
http://www.everything2.com/index.pl?...astnode_id=124
http://www.kuro5hin.org/story/2002/4/15/103358/720
I don't think it holds much water -- it sounds way too good to be true, and hoaxers abound on the Internet. But if anyone here is interested in giving it a try, I would LOVE to be proven wrong.