Everything You Always Wanted To Know About Sleep (But Were Too Afraid To Ask) 
And for reference, Wikipedia's entry on polyphasic sleep.
http://scienceblogs.com/clock/2006/06/everything_you_always_wanted_t.php

And for reference, Wikipedia's entry on polyphasic sleep.
http://scienceblogs.com/clock/2006/06/everything_you_always_wanted_t.php