It has been 5 years since publication of the first edition of Dr. Attarian's Clinical Handbook of Insomnia which at the time was the first significant cl- ical textbook dedicated to insomnia, an often overlooked but important me- cal problem. The book was very well received. There has now been sufficient new information on the subject to warrant a second expanded edition of this very useful volume. Then, as now, the approach is to emphasize the frequent biological causes of insomnia rather than to attribute it primarily to underlying psychological and emotional factors. This new edition is an...