This book presents an all-inclusive account on the vast field of sleep disorders. To enhance the prospects of advancement in a clinical field like sleep medicine, free flow of information and developments in clinical practice should be available. This book provides latest information and advances in the field of sleep disorders for the reference of researchers, scientists, physicians and concerned individuals. It overcomes barriers in the way of dissemination of information and thereby, communicates effectively about ongoing researches in this field. The topics in this book reflect observations and leading edge ideas relating to various issues and aspects of sleep disorders. Special emphasis has been laid on medical and social aspects of sleep-related disorders. These aspects focus on different groups, from children to adults, pregnant women, professional workers and adolescents.