Sex is beyond reason, and yet we constantly reason about it. So, too, did the peoples of ancient Greece and Rome. But until recently there has been little discussion of their views on erotic experience and sexual ethics. The Sleep of Reason brings together an international group of philosophers, philologists, literary critics, and historians to consider two questions normally kept separate: how is erotic experience understood in classical texts of various kinds, and what ethical judgments and philosophical arguments are made about sex? From same-sex desire to conjugal love, the contributors demonstrate the complexity and diversity of classical Greek and Roman sexuality.