At Day's Close by Roger Ekirch is a great book about our historical relationship to the night (sleep and not sleeping). http://www.amazon.com/At-Days-Close-Nigh

At Day's Close by Roger Ekirch is a great book about our historical relationship to the night (sleep and not sleeping). http://www.amazon.com/At-Days-Close-Night-Times/dp/0393329011 http://www.amazon.com/At-Days-Close-Night-Times/dp/039332901...