In youth, the thought of spending one third of life sound asleep seems a ridiculous waste of time. In midlife, battling insomnia, sleep becomes mysterious and precious. Sleep is the source of physical rejuvenation; skin, the landscape of mortality. If you examine skin closely you can see how little it resembles the stereotypical surface we imagine ourselves clothed in. Sleep is also the source of psychological rejuvenation. As conscious mind rests, unconscious mind awakens and dreams drink from experiences overlooked by the conscious mind.