An exhaustive overview of the science of sleep, with practical concrete conclusions on the meaning of what we currently know. Not only why we sleep, but also what does it do to us, our minds, our thinking and our memory, our physiology - even our society - when we do not sleep enough, as we are prone to do in contemporary western culture societies.

First chapter alone scared me - and ironically probably cost me half a nights sleep - but at the end it strengthened my resolve on working hard on getting more sleep.