In spite of Coleridge's remarkable dedication to understanding dreams and dreaming, there have been very few studies dealing with his writings on dreams. There is no single collection of all of his dream cogitations; his thoughts remain scattered throughout his marginalia, notebooks, letters and formal writings. Nor has there been a comprehensive or contextual study of these dream writings. This book seeks to explore what Kathleen Coburn in 1979 rightly called a ‘subject in itself’; the ‘richness and variety of Coleridge's notes on sleep and dreaming’. His insightful observations on the ‘most interesting’ features of dreams, visions and ghosts, gathered together in the following pages, reveal the extent to which he utilised his own dreaming experiences as well as those he encountered through his wide reading. My emphasis throughout is on discovering what Coleridge's contemporaries wrote and thought about dreams and dreaming, and the ways in which his own experiences often challenged these contemporary theories. I particularly focus on Coleridge's exploration of dreams and dreaming states in his notebooks, because these have not yet been systematically studied, and because they yield the richest, the most surprising and most comprehensive discussion of dreams in his writings.