Summary: Question of the study: The aim of this pilot study was to assess adolescents' self-reported sleep quantity and personality traits in order to describe typical personality patterns related to sleep and characteristics that distinguish between good and poor sleepers. Participants and methods: A total of 134 adolescents (mean age: 18.60; 74 females and 60 males) completed a single sleep-related personality traits questionnaire (FEPS-I) and daily sleep logs for seven consecutive days. The daily logs data were used to cluster participants in three subgroups of poor, normal, and good sleep quality. Results: Up to 25 % of the adolescents could be considered ‘poor' sleepers and displayed personality traits such as decreased self-confidence, increased mental arousal, and self-perception of body sensations. Female adolescents were at high risk of being ‘poor' sleepers, yet up to 20 % of the adolescents could be described as ‘good' sleepers. Fifty-five per cent of the adolescents could be considered ‘normal' sleepers without appropriate sleep-related personality traits or sleeping habits. Conclusions: The pilot project, using exclusively self-reported sleep data, showed that about a quarter of adolescents were considered ‘poor' sleepers with specific sleep-related personality traits. Further investigations are needed to support these results and to allow possible preventive intervention