BACKGROUND: The aim of the present study was to investigate the frequency and correlates of a variety of sleep problems in adolescents. METHODS: A representative school-based sample of 3485 eighth to twelfth graders was selected according to cluster sampling technique. A sleep questionnaire and the Strengths and Difficulties Questionnaire were filled in by the students along with their parents. Logistic regression analyses were performed to identify the independent variables of insomnia, parasomnias and excessive daytime sleepiness (EDS). RESULTS: Initiation insomnia, maintenance insomnia, non-restorative sleep (NRS) and EDS were described by 12.4%, 10.7%, 9% and 9.7%, respectively. At least one parasomnia with frequency above the median of the population was reported by 23.4% (nightmare 12.8%, sleep terror 3.6%, sleepwalking 2.5%, bruxism 2.5% and sleep talking 10.9%). Insomnias and parasomnias were highly associated with each other. Female gender was related to maintenance insomnia, NRS and night terror. Emotional problems correlated with initiation insomnia, maintenance insomnia, NRS, EDS, nightmares and bruxism; hyperactivity/inattention with initiation insomnia, NRS and sleep talking. Conduct problems were associated with NRS, whereas poor school performance with initiation insomnia. CONCLUSION: Self-reported sleep problems were prevalent and highly associated with each other and behavioural and emotional difficulties in Turkish adolescents. Language: en