“Insomniac” by Gayle Greene is a 520-page textbook published by University of California Press in 2008. The book explores the subject areas of psychology and medical science, specifically focusing on the issue of insomnia and its impact on health care delivery. Written in English, the hardcover format makes it a valuable resource for those interested in the topic. With detailed insights and analysis, this textbook provides a comprehensive look at the complex nature of insomnia and its effects on individuals and society.