A representative cross section of the latest work in sleep research is presented in this book based on the international symposium "Sleep and Health Risk" held in Marburg in 1989. Clinical work, basic research and methodology are described by leading specialists in the field. The clinical topics cover both the diagnosis and therapy of various sleep and sleep-related disturbances. The methodology section includes the newest observation and analysis techniques. Other sections discuss neurological aspects, sleep-related breathing disorders, occupational medicine, cardiovascular diseases, pediatrics, endocrinology and the psychiatry of insomnia.