title: Mood Influences the Concordance of Subjective and Objective Measures of Sleep Duration in Older Adults.
abstract: OBJECTIVE
  Sleep plays a central role in maintaining health and cognition. In most epidemiologic studies, sleep is evaluated by self-report questionnaires but several reports suggest that these evaluations might be less accurate than objective measures such as polysomnography or actigraphy. Determinants of the discrepancy between objective and subjective measures remain to be investigated. The aim of this pilot-study was to examine the role of mood states in determining the discrepancy observed between objective and subjective measures of sleep duration in older adults.
  
  
  METHODS
  Objective sleep quantity and quality were recorded by actigraphy in a sample of 45 elderly subjects over at least three consecutive nights. Subjective sleep duration and supplementary data, such as mood status and memory, were evaluated using ecological momentary assessment (EMA).
  
  
  RESULTS
  A significant discrepancy was observed between EMA and actigraphic measures of sleep duration (p < 0.001). The magnitude of this difference was explained by the patient's mood status (p = 0.020). No association was found between the magnitude of this discrepancy and age, sex, sleep quality or memory performance.
  
  
  CONCLUSIONS
  The discrepancy classically observed between objective and subjective measures of sleep duration can be explained by mood status at the time of awakening. These results have potential implications for epidemiologic and clinical studies examining sleep as a risk factor for morbidity or mortality.
authors: Université de Bordeaux, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France.
authors: Marion
authors: M
authors: Baillet
authors: CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; EPHE, Laboratoire Neurobiologie et Vie QuotidienneBordeaux, France.
authors: Charlotte
authors: C
authors: Cosin
authors: CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; EPHE, Laboratoire Neurobiologie et Vie QuotidienneBordeaux, France.
authors: Pierre
authors: P
authors: Schweitzer
authors: Université de Bordeaux, ISPED, Centre INSERM U1219 - Bordeaux Population Health Research CenterBordeaux, France; INSERM, ISPED, Centre INSERM U1219 - Bordeaux Population Heath Research CenterBordeaux, France.
authors: Karine
authors: K
authors: Pérès
authors: Université de Bordeaux, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; EPHE, Laboratoire Neurobiologie et Vie QuotidienneBordeaux, France.
authors: Gwenaëlle
authors: G
authors: Catheline
authors: Université de Bordeaux, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition HumaineBordeaux, France; EPHE, Laboratoire Neurobiologie et Vie QuotidienneBordeaux, France.
authors: Joel
authors: J
authors: Swendsen
authors: CNRS, INCIA, UMR 5287 - Equipe NeuroImagerie et Cognition Humaine Bordeaux, France.
authors: Willy
authors: W
authors: Mayo
keywords: actigraphy; aging; ecological momentary assessment; mood; sleep duration