AUTHOR=Hjetland Gunnhild Johnsen , Skogen Jens Christoffer , Hysing Mari , Gradisar Michael , Sivertsen Børge TITLE=How and when screens are used: comparing different screen activities and sleep in Norwegian university students JOURNAL=Frontiers in Psychiatry VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2025.1548273 DOI=10.3389/fpsyt.2025.1548273 ISSN=1664-0640