Three Hours of Sleep per Day

Polyphasic Sleep, as explained in its Wikipedia entry, is "achieved by spreading out sleep into short naps of around 20-45 minutes throughout the day". While little scientific research has been done on the subject, a subculture of bloggers have taken to testing this odd sleeping pattern.

Steve Pavlina is one such blogger who has written an intensely detailed number of blog entries regarding his foray into polyphasic sleep over the course of a ninety day period.