Cohort profile: The SmartSleep Study , Denmark, combining evidence from survey, clinical and tracking data.
Naja Hulvej RodThea Otte AndersenElin Rosenbek SeverinsenChristoffer SejlingAgnete DissingVi Thanh PhamMette NygaardLise Kristine Højsgaard SchmidtHenning Johannes DrewsTibor V VargaNina La Cour FreieslebenHenriette Svarre NielsenAndreas Kryger JensenPublished in: BMJ open (2023)
allow for a comprehensive documentation of smartphone activity during the entire sleep span. The study has been expanded by linkage to nationwide registers, which allow for further investigations into the long-term health and social consequences of night-time smartphone use. We also plan new rounds of data collection in the coming years.