I found this article very useful to ppl around me. I can't believe how could Chalfonters sleep only 3,4,5,(6,7,8) hours almost every day ...(7,8) hours is me . Well I hope this would benefit to someone who needs not to sleep.

Polyphasic sleep is a term used to describe several alternative sleep patterns intended to reduce sleep time to 2–6 hours daily in order to achieve a better quality of sleep. This is achieved by spreading out sleep into short naps of around 15–30 minutes throughout the day, and in some variants, a core sleep period of a few hours at night.

The term "polyphasic sleep" itself refers only to the practice of sleeping multiple times in a 24-hour period (usually, more than two, in contrast to "biphasic sleep") and does not imply any particular schedule.