Sleep can be viewed as a brain state, as a process and a behavior. As any of these, sleep serves several purposes, including energy restoration, immunocompetence, brain metabolic homeostasis, neural ontogenesis and, importantly, cognitive, emotional and social processing. Supported by a strong empirical backbone focused on contemporary research outlining links between these subjects, this book will offer a guide to state-of-the-art research of sleep mechanisms, its impact in many cognitive and affective features as well as brief but in-depth overview of the strong association between sleep...