This book seemed to tell you what you could find out by reading the first five websites in a Google search for sleep insomnia. There is a quiz in the book to help you rate your issue, but the questions seemed to be very vague.
from title: "An expert on sleep disorders shares the latest research to help you conquer your insomnia. End your sleepless nights and fatigue without drugs or medication. Discover the facts about the 'miracle' melatonin - what it can and can't do. Patient-tested sleep techniques from one of the world's leading hospitals."