CHAIRS: Jorge Alberto Costa e Silva, Thomas Roth, Michael Chase Part 1: Costs of Insomnia Chronic Insomnia, Ability To Function And Quality Of Life James Walsh (USA) Economics/Direct and Indirect Costs of Insomnia Damien Léger (France) Psychiatric Co-Morbidity Ruth Benca (USA) Epidemiological Perspectives Maurice Ohayon (Canada) Part 2: Cognitive Function Effects of Hypnotic Medication on Psychological Functioning Malcolm Lader (United Kingdom) Cognitive Function In Sleep Disorders Meir Kryger (Canada) Sleep-Wake State and Memory Function Timothy Roehrs (USA) Part 3: Primary Care Multidimensional Approach to the Management of Insomnia Göran Hajak (Germany) Residency Education in Sleep Disorders Steve Brunton (USA) Diagnosis and Management of Sleep Problems in Primary Care: A challenge for public health Bedirhan Üstün (Turkey) Epidemiological Implications Terry Young (USA) Part 4: Circadian Rhythms Hormonal and Pharmacological Manipulation of the Circadian Clock: Recent developments and future strategies Gary Richardson (USA) Psychiatric Disorders Associated with Disturbed Sleep and Circadian Rhythms Daniel Buysse (USA) Circadian Rhythms Circadian Clocks/Aging Jeanne Duffy (USA) top