['Lay and scientific opinion alike hold that physical activity is efficient as both remedy and preventative measure for poor sleep. There is evidence that strenuous exercising of adolescent elite athletes leads to favourable sleep patterns. However, research on this in non-elite athletes is limited. The aim of the present study was to compare sleep-EEG patterns of higher leisure time exercisers and controls.', 'A total 38 adolescents (M = 18.59) took part in the study; 17 were high, and 21 were low exercisers. Mean weekly exercise duration was 8.5 h for high and 2 h for low exercisers. Sleep-EEG recordings were performed following a day without exercise. Participants also completed questionnaires regarding their psychological functioning.', 'Compared to low exercisers, high exercisers had more slow wave sleep, and less light and REM sleep, higher scores for positive coping and curiosity, and lower scores for depressive symptoms and somatosensory amplification. Multiple regression analyses showed that weekly exercise duration predicted shortened SOL, low number of awakenings, and increased slow wave sleep.'] Are exercising , sleep-EEG patterns , and psychological functioning related among adolescents?