A sleep disorder is a condition that affects normal patterns of sleep and wakefulness. Although sleep disorders are not new, modern life seems to be intensifying the problem. Round the clock work schedules, globalization of commercial markets, stores that never close, television, and the Internet have all contributed to people sleeping less. Americans averaged nine hours of sleep per night in 1910. Today they average only 6.5 hours. This well-researched and up-to-date book offers readers a thorough overview of the many types of sleep disorders and how they are currently being treated. It talks about how people live and cope with sleep disorders. It also looks at current trends in sleep research. This resource includes a glossary, sources for further research, and a thorough subject index.