John Augustine Waller's 'A Treatise on the Incubus, or Night-Mare, Disturbed Sleep, Terrific Dreams and Nocturnal Visions' is a captivating exploration of the phenomenon of sleep paralysis through the lens of 19th-century science and psychology. Written in a scholarly and analytical style, Waller delves into the causes and effects of this mysterious condition, offering both historical context and medical insights. The book provides a fascinating glimpse into the study of abnormal psychology during this period, shedding light on how such experiences were perceived and understood. With detailed case studies and academic analysis, Waller presents a comprehensive examination of the Incubus, shedding light on the fears and anxieties surrounding sleep and dreams in the Victorian era. John Augustine Waller, a renowned psychologist and researcher in the field of sleep disorders, brings a wealth of knowledge and expertise to his study of the Incubus phenomenon. His background in medicine and psychology gives him unique insight into the human mind and its complexities, allowing him to provide valuable contributions to the understanding of this intriguing phenomenon. Readers interested in the history of psychology, abnormal behaviors, and the mysteries of the subconscious will find Waller's treatise both enlightening and thought-provoking. 'A Treatise on the Incubus' is a must-read for anyone curious about the intersection of science and the supernatural in the study of sleep and dreams.