Seeing as I have an inability to get more than five or six hours of uninterrupted sleep a night, polyphasic sleep has always appealed to me. My life is a constant struggle against sleep deprivation and running a startup for the past year hasn't helped matters one bit.

Still, it's rather hard to see a way for a sleep schedule like this to be viable for most people unless it becomes the dominant way that people find their rest (which is hardly likely).