Ubersleep: Nap-Based Sleep Schedules and the Polyphasic Lifestyle
Now in its Second Edition!
~ Print format ~
~ EBook format ~
~ Kindle format ~
The new edition contains almost 100 pages of new content, a fresh (and gorgeous) redesign inside and out, and a real e-reader-compatible electronic format (as opposed to a PDF, which was totally cutting-edge electronic format back in 2008 ;).
Read the story of the book, and more details about the contents, here!