The factorial structure of sleep dissatisfaction

Research into sleep problems has been dominated by a number of theoretical perspectives from each of which useful treatment applications have been derived. However, the rich diversity of problems that are subsumed under insomnia or sleep disturbance often remain unappreciated. This paper reports the results of a factor analysis performed on the combined items of two questionnaires designed to assess sleep disturbance. Six factors are described, two of which relate to cognitive aspects of sleep disturbance; two which map onto sleep onset and sleep maintenance problems; and two which are drawn from dissatisfaction with poor sleep. Correlations of factor scores with measures of neuroticism, worry and various sleep history variables provide a strong level of construct validity. The results are discussed in terms of their treatment implications.