Journal of Abnormal Psychology
NLM Title Abbreviation
J Abnorm Psychol
Although 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, Sleep, Factor Analysis
Published Article/Book Citation
The definitive version was published in Journal of Abnormal Psychology, 118:1 (2009) pp. 183-194. DOI: 10.1037/a0013945
Author Posting. Copyright © 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. It is posted here by permission of the APA for personal use, not for redistribution.
The definitive version was published in Journal of Abnormal Psychology, Vol 118(1), Feb 2009, 183-194. doi: 10.1037/a0013945