[Correlates of disordered sleep: a replication study].

90 good and 106 bad sleepers were compared in respect to sleep quality and quantity as well as to several other aspects of life. Several questionnaires were used to measure sleep and day time behavior. In addition, a newly developed sleep questionnaire, containing 60 items, was used and factor analysed. The three resulting factors were "helplessness", "distress" and "attitude about sleep". The comparisons between good and poor sleepers showed that stress and insufficient coping skills contribute to the maintenance of sleeping disorders. These results represent a successful replication of a previous study. The comparisons between the different subclasses of sleep disorders showed a few differences, but essentially the conclusions are true for all of the three kinds of sleep disorders. Consequences for the target areas addressed in the treatment of sleep disorders are discussed.