In addition to the lack of any clear organizing structure, there is also a good deal of redundancy in the chapters. Discussions of periodic limb movements of sleep, the parasomnias, REM behavior disorder, and bruxism appear over and over in chapters written by different groups, many of which cite the same references. There are, in addition, six chapters on restless legs syndrome. Nonetheless, there is a good deal to recommend in this book. In "An Approach to a Patient With Movement Disorders During Sleep and Classification," the editors provide a very well written overview of the subject that gives a short summary of the clinical entities covered in this volume. The chapter by Malow and Plazzi on nocturnal seizures is worth the price of the book alone. It is beautifully organized and illustrated and includes two useful case histories. It helps to distinguish among the various epilepsies and the distinctions between these and the non-REM parasomnias. Some of the same ground is covered in the chapter by Zucconi. There are also two chapters on sleep in Parkinson’s disease and the relation of this to REM behavior disorder.