STUDY OBJECTIVES: (1) To describe the prevalence and prospective course of insomnia in a representative young-adult sample and (2) to describe the cross-sectional and longitudinal associations between insomnia and depression. DESIGN: Longitudinal cohort study. SETTING: Community of Zurich, Switzerland. PARTICIPANTS: Representative stratified population sample. INTERVENTIONS: None. MEASUREMENTS AND RESULTS: The Zurich Study prospectively assessed psychiatric, physical, and sleep symptoms in a community sample of young adults (n=591) with 6 interviews spanning 20 years. We distinguished 4 duration-based subtypes of insomnia: 1-month insomnia associated with significant distress, 2- to 3-week insomnia, recurrent brief insomnia, and occasional brief insomnia. The annual prevalence of 1-month insomnia increased gradually over time, with a cumulative prevalence rate of 20% and a greater than 2-fold risk among women. In 40% of subjects, insomnia developed into more chronic forms over time. Insomnia either with or without comorbid depression was highly stable over time. Insomnia lasting 2 weeks or longer predicted major depressive episodes and major depressive disorder at subsequent interviews; 17% to 50% of subjects with insomnia lasting 2 weeks or longer developed a major depressive episode in a later interview. "Pure" insomnia and "pure" depression were not longitudinally related to each other, whereas insomnia comorbid with depression was longitudinally related to both. CONCLUSIONS: This longitudinal study confirms the persistent nature of insomnia and the increased risk of subsequent depression among individuals with insomnia. The data support a spectrum of insomnia (defined by duration and frequency) comorbid with, rather than secondary to, depression.
STUDY OBJECTIVES: (1) To describe the prevalence and prospective course of insomnia in a representative young-adult sample and (2) to describe the cross-sectional and longitudinal associations between insomnia and depression. DESIGN: Longitudinal cohort study. SETTING: Community of Zurich, Switzerland. PARTICIPANTS: Representative stratified population sample. INTERVENTIONS: None. MEASUREMENTS AND RESULTS: The Zurich Study prospectively assessed psychiatric, physical, and sleep symptoms in a community sample of young adults (n=591) with 6 interviews spanning 20 years. We distinguished 4 duration-based subtypes of insomnia: 1-month insomnia associated with significant distress, 2- to 3-week insomnia, recurrent brief insomnia, and occasional brief insomnia. The annual prevalence of 1-month insomnia increased gradually over time, with a cumulative prevalence rate of 20% and a greater than 2-fold risk among women. In 40% of subjects, insomnia developed into more chronic forms over time. Insomnia either with or without comorbid depression was highly stable over time. Insomnia lasting 2 weeks or longer predicted major depressive episodes and major depressive disorder at subsequent interviews; 17% to 50% of subjects with insomnia lasting 2 weeks or longer developed a major depressive episode in a later interview. "Pure" insomnia and "pure" depression were not longitudinally related to each other, whereas insomnia comorbid with depression was longitudinally related to both. CONCLUSIONS: This longitudinal study confirms the persistent nature of insomnia and the increased risk of subsequent depression among individuals with insomnia. The data support a spectrum of insomnia (defined by duration and frequency) comorbid with, rather than secondary to, depression.
Authors: Mikhil N Bamne; Hader Mansour; Timothy H Monk; Daniel J Buysse; Vishwajit L Nimgaonkar Journal: Sleep Med Rev Date: 2010-03-17 Impact factor: 11.609
Authors: Carla R Jungquist; Jaime Mund; Alan T Aquilina; Karen Klingman; John Pender; Heather Ochs-Balcom; Edwin van Wijngaarden; Suzanne S Dickerson Journal: J Clin Sleep Med Date: 2016-03 Impact factor: 4.062
Authors: Deborah Da Costa; Phyllis Zelkowitz; Kaberi Dasgupta; Maida Sewitch; Ilka Lowensteyn; Rani Cruz; Kelly Hennegan; Samir Khalifé Journal: Am J Mens Health Date: 2015-09-18
Authors: Carol Chu; Melanie A Hom; Austin J Gallyer; Elizabeth A D Hammock; Thomas E Joiner Journal: J Affect Disord Date: 2018-09-18 Impact factor: 4.839
Authors: Allison K Wilkerson; Gregory L Sahlem; Brandon S Bentzley; Jessica Lord; Joshua P Smith; Richard O Simmons; Thomas W Uhde; Sarah W Book Journal: J Subst Abuse Treat Date: 2019-06-07