I think this one is no longer a myth:<p>3. Some people function perfectly on four hours of sleep.<p>I read about a gene that some people have that lets them do this: <a href="http://sciencenow.sciencemag.org/cgi/content/full/2009/813/2" rel="nofollow">http://sciencenow.sciencemag.org/cgi/content/full/2009/813/2</a>