2. People With Insomnia May Be Plagued for Awhile - US News and World Report
Serious sleep problems often last a year or more, study finds

3. Insomnia Costs Billions in Lost Productivity - US News and World Report
Canadian study hints at huge costs here in the United States

4. Insomnia Symptoms - US News and World Report
Common symptoms include irritability and morning headaches.

5. Primary Insomnia : Symptoms  (Trust Mark: Doctor-Reviewed)
Difficulty falling asleep; Feeling tired; Waking up several times during sleep. People who have primary insomnia tend to keep thinking about getting enough sleep. The more they try to sleep, the greater the sense of frustration and distress, and t...• Reviewer: Christos Ballas, M.D., Attending Psychiatrist, Hospital of the University of Pennsylvania, Philadelphia, PA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

6. Insomnia  (Trust Mark: Doctor-Reviewed)
Insomnia is the inability to obtain an adequate amount or quality of sleep. The difficulty can be in falling asleep, remaining asleep, or both. People with insomnia do not feel refreshed when they wake up. Insomnia is a common symptom affecting mi...• Author: Liz Swain