Classical EEG is still very useful in many medical fields, like internal medicine, infectious diseases, neurology, neurosurgery, neuro-oncology, psychiatry, sleep disorders, toxicology, metabolic disorders, neurodegenerative disorders, coma, and research in neuroscience, and clinical sleep medicine is becoming very popular in general medical practice. The purpose of this book is to report very atypical facts and findings in both of them. We will not hesitate to say that this book will repre- sent a very beautiful experience for both EEG and clinical sleep medicine lovers. We wish you a very good reading, and all the best.