The Fall of Sleep - Jean-Luc Nancy - Bog

What does it mean to 'fall' asleep? Might there exist something like a 'reason' of sleep, a reason at work in its own form or modality, a modality of being in oneself, of return to oneself, without the waking 'self' that distinguishes 'I' from 'you' and from the world? This book attempts to answer these questions.