Allgemeine Quellen:

www.aerzteblatt.de/nachrichten/96673/Schlafstoerungen-bei-Jugendlichen-nehmen-zu

www.aerztezeitung.de/politik_gesellschaft/praevention/article/971825/medienkonsum-viele-jugendliche-haben-schlafstoerungen.html

www.gesundheit.de/lexika/medizin-lexikon/schlaf

www.dgsm.de

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