www.psychexamreview.com
In this video I describe the polyphasic sleep schedules often promoted by lifehackers as ways of reducing the need for sleep. Though these schedules originate from sleep research, they are intended for maintaining performance in situations necessitating chronic sleep deprivation rather than for use as a long-term schedule when chronic sleep deprivation isn't necessary or desirable. These schedules don't align well with our circadian rhythm and the risks of chronic sleep deprivation (including immune suppression, obesity, cognitive deficits, reduced physical performance, and increased risk of accidents) far outweigh the possible benefits of a few extra hours of time awake each day.

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Drowsy Driving Facts and Stats
http://drowsydriving.org/about/facts-and-stats/

How Awake Are You? - Driving Reaction Time Test
http://healthysleep.med.harvard.edu/need-sleep/whats-in-it-for-you/how-awake-are-you