Abstract STUDY OBJECTIVES: Short and long sleep duration are linked to reduced kidney function, but little research has examined how sleep is associated with hydration status. Our aim was to assess the relationship between sleep duration and urinary hydration biomarkers among adults in a cross-cultural context. METHODS: Three samples of adults aged 20y were analyzed: 2007-2008 National Health and Nutrition Examination Survey (NHANES; n=4,680), 2009-2012 […]