Polyphasic Sleep?

Another thing in the book The 4-Hour Body is discussion of polyphasic sleep.  This is the kind of sleep pattern supposedly used by Thomas Edison and Albert Einstein, where one sleeps in a bunch of naps rather than all at once.  I am trying to figure out the time schedules, but the graphic in the book is not very well done.  I then tried one of the links in the book, but that is to a restricted blog site.  I will try some of the other links later tonight in the hopes of figuring out the gaps between sleep times.