Chapter 5 touched on the concepts of circadian rhythm, as well as the various stages of sleep. This made me remember an article I came across thanks to Stumbleupon. Below I have included the link to the specific article. It talks about nontraditional sleep cycles, and the success thereof. One of the cycles listed is called the Biphasic sleep cycle. This is the sleep cycle that most college students use. It consists of a shorter night's sleep, and a midday nap. The sleep cycle that I find most unique is called the Dymaxion sleep cycle. It involves four naps, 30 minutes each, perfectly evenly spaced. A diagram of this is shown below. What is so shocking is that people on this sleep cycle only get two hours of sleep each night. However, according to believers and users of this lifestyle, as long as they adhere strictly to the plan, they have few to no negative effects. It simply seems shocking to me that it is possible to get such little sleep and still be able to focus and succeed at day to day living.

http://www.highexistence.com/alternate-sleep-cycles/
http://www.highexistence.com/wp-content/uploads/2009/05/dymaxion.png
I thought this post was very interesting. I think it would be very interesting to do experiments to see if there actually were any negative effects involved with these sleep cycles. I can't imagine it would be a very fun process to get used to something like this because personally i feel the negative effects of messing up my sleep schedule for up to a week afterwards. I really enjoyed reading this article you posted but I'm not sure how much of it is believable. The main reason I question it is the fact that it keeps calling certain sleep cycles 'efficient'. Sure it's a time saver but it seems like it could have a negative impact on your health.