There was a novel I also read regarding this one wolf researcher in far north Canada- the man followed the wild wolf pack's behaviors, and in turn, he had to learn to sleep like them- sleeping for 2-3 hours every 4-5 hours.

When he returned home, he found he was much more energized and productive if he was following a similar sleep schedule to the wolves. I think that would be optimal, but probably not practical for a 9-5 job, but still- I'd love to try it.