Dr.Patricia A. Farrell, a well-known author/psychologist has written this book on sleep for all those who wish they could get a restful night's sleep. Included in the updated and revised book is the latest information on why we must sleep, how our immune system is affected, how long we need to sleep, whether or not naps are helpful, what happens while we sleep (very exciting), the medical disorders that are associated with lack of sleep, how to use...