This thesis is made as a part of Folkhälsans förbund’s project ”De e lugnt – Stresshanter-ing för unga”. The purpose is to describe how the adolescents at the age of 16-20 year in Finland perceive stress and stress management, with what kind of extent they suffer from stress and how sleeping habits and physical activity correlate with stress. The method was quantitative and the research instrument used was an online questionnaire that was done in every Swedish speaking general upper secondary school, vocational institution and youth workshop. in Finland. The research questions cover how the adolescents perceive stress and stress management, their sleeping habits and physical activity as well as how sleep and physical activity correlate with stress. These themes have been answered from a general perspective from the answers from the whole sample as well as separately for the orientations general upper secondary schools, vocational institutions and youth work-shops. Results: approximately 15% of the adolescents experienced stress at high level. It came up that the adolescents who experienced stress at high level did not feel themselves as rested as the others and that sleeping problems were more common among them. The adolescents who regularly were physically active experienced less stress on average.