Sleep is overwhelmingly important to all of us. No other activity takes up so much of our lives - it has been estimated that the average person sleeps for a total of about 25 years - and yet it is something that we still know suprisingly little about. Sleep problems are among the most common and complained-of human ailments. Anyone who has felt awful after one bad night will be able to appreciate the misery of those who have suffered from chronic insomnia for long periods of time. For those people, this book explores the range of therapies that can help.