Is Sleep Essential?

biology.plosjournals.org — Everybody knows that sleep is important, yet the function of sleep seems like the mythological phoenix: ?Che vi sia ciascun lo dice, dove sia nessun lo sa? (?that there is one they all say, where it may be no one knows,? Wolfgang Amadeus Mozart and Lorenzo da Ponte [1790], Cos? fan tutte). But what if the search for an essential function of sleep i Aug 26, 2008 View in Crawl 4