“沉睡的有福了”,尼采写道,“他们很快就会下降。”睡眠is an extraordinarily, albeit profoundly odd, phenomenon, yet we seem to accept prolonged nightly blackouts without question. Still, sleep has played a major role in philosophical thought, with the likes of Aristotle, Locke, and Leibniz putting forth theories about just what exactly sleep and dreams are. So what is the purpose of sleeping and dreaming? How can we distinguish wakefulness from sleep, as Descartes wondered? Do we experience dreams consciously? And do we sleep to live, or live to sleep? Ken and guest co-host Jorah Danenberg stay up with Deirdre Barrett from the Harvard Medical School, author of睡眠委员会——艺术家、科学家和运动员如何利用梦境创造性解决问题的能力。