Aim: To assess behavioral and sleep disturbances in childhood, it is necessary to implement standardized brief questionnaires for children and their parents. Especially complaints of insomnia often are underdiagnosed in pediatric medicine. Methods: We developed a sleep questionnaire (K?SI-KJ) and used it together with German versions of the SDQ (parent and child reports) for epidemiologic studies in Cologne. The sleep questionnaire obtains 33 items for parents and 28 items for children. Ratings were dichotomized for this analysis in “sometimes/ often present” versus “not present”. The German versions of SDQ contain 5 subscales each with 5 items. Data from a sample of 1490 children of fourth grade in elementary schools inCologne(age ranged from 8 to 11 years) are shown. Results: Children indicate signs of sleep disturbances in higher frequency than their parents do. Concerning gender and ethnical group, there no significant differences can be shown. Children with signs of insomnia, dyssomnia, daytime sleepiness or restless sleep showed significantly higher scores for all relevant SDQ subscales in parental and children's reports. Children with signs of parasomnia showed higher scores concerning emotional problems and the SDQ total score. Children with enuresis showed higher scores for all SDQ subscales and the total score.