Sleep Problems as a Mediator of the Association between Parental Education Levels, Perceived Family Economy and Poor Mental Health in Children Tormod Bøe, Mari Hysing, Kjell Morten Stormark, Astri J. Lundervold, Børge Sivertsen January 2012 Cite DOI ses sleep sdq bcs bergen child study sleep ses sdq bergen child study bcs Related Sleep and School Attendance in Adolescence: Results from a Large Population-Based Study.