The Two-Factor Structure of Sleep Complaints and Its Relation to Depression and AnxietyJournal of Abnormal Psychology
NLM Title AbbreviationJ Abnorm Psychol
DOI of Published Version10.1037/a0013945
AbstractAlthough sleep complaints are common in depression and anxiety, there is little agreement as to how they should be organized and assessed. It is also unclear whether sleep complaints show specificity with certain disorders or if they are nonspecific symptoms. We examined the structure of sleep complaints and the relations of these complaints to depression and anxiety in three samples: college students, older adults, and psychiatric patients. Exploratory and confirmatory factor analyses indicated that sleep complaints consistently defined two distinct dimensions: Insomnia and Lassitude. The Insomnia factor included indicators of early, middle, and late insomnia, as well as poor sleep quality. The Lassitude factor included measures of hypersomnia, fatigue, and sleepiness. Both factors were significantly related to symptoms and diagnoses of depression and anxiety. However, Lassitude was more strongly related to symptoms of depression and anxiety than was Insomnia. In addition, Lassitude showed specificity to measures and diagnoses of depression compared to anxiety disorders. This specificity can be explained by Lassitude’s relation with negative and positive emotionality, both of which are components of depression.
- Major Depression,
- Anxiety Disorders,
- Factor Analysis
Granting or Sponsoring AgencyNational Institute of Mental Health
Journal Article VersionAuthor's Original
Published Article/Book CitationJournal of Abnormal Psychology, 118:1 (2009) pp. 183-194. DOI: 10.1037/a0013945
RightsCopyright © American Psychological Association, 2009. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record. Posted by permission.
Citation InformationErin Koffel and David Watson. "The Two-Factor Structure of Sleep Complaints and Its Relation to Depression and Anxiety" Journal of Abnormal Psychology Vol. 118 Iss. 1 (2009) p. 183 - 194 ISSN: 0021-843X
Available at: http://works.bepress.com/erin_koffel/1/