See also: <a href="http://news.ycombinator.com/item?id=1051616" rel="nofollow">http://news.ycombinator.com/item?id=1051616</a><p>Also a year ago some interesting stuff:<p><a href="http://news.ycombinator.com/item?id=187588" rel="nofollow">http://news.ycombinator.com/item?id=187588</a><p><a href="http://www.scientificamerican.com/article.cfm?id=fact-or-fiction-can-you-catch-up-on-sleep" rel="nofollow">http://www.scientificamerican.com/article.cfm?id=fact-or-fic...</a><p><a href="http://www.supermemo.com/articles/sleep.htm" rel="nofollow">http://www.supermemo.com/articles/sleep.htm</a>