{"id":{"repo_id":"reykjavik","oai_identifier":"oai:skemman.is:1946/44626"},"canonical_url":"https://search.dev.ndltd.org/etd/reykjavik/oai:skemman.is:1946/44626","repository":{"repo_id":"reykjavik","name":"Reykjavík University","base_url":"https://skemman.is/oai/request"},"display":{"title":"The relationship between caffeine, sleep, and mental health in Icelandic adolescents","abstract":"Sleep is essential for people’s health and well-being, especially for adolescents, who undergo many physical and mental changes. Many adolescents do not follow sleep recommendations, which can contribute to mental illnesses such as anxiety and depression. Caffeine is one of the factors that can disrupt sleep and has been linked to mental health problems as well. The aim of this cross-sectional study was to investigate whether there was a relationship between sleep quality, caffeine consumption, and mental health among 195 Icelandic adolescents, as well as if caffeine consumption mediated the relationship between sleep quality and mental health. Correlation and mediation analyses were used. Results showed a significant relationship between sleep quality and depression as well as between sleep quality and anxiety, with worse sleep quality resulting in more depression and anxiety. There was a non-significant relationship between sleep quality and caffeine consumption. Caffeine did not have a significant relationship with anxiety or depression. According to the findings, caffeine consumption did not mediate the relationship between sleep quality and depression, nor did it mediate the relationship between sleep quality and anxiety. It was therefore concluded that sleep affects adolescents' mental health, but caffeine consumption does not. Keywords: Adolescents, sleep quality, depression, anxiety, caffeine","abstract_html":"Sleep is essential for people’s health and well-being, especially for adolescents, who undergo many physical and mental changes. Many adolescents do not follow sleep recommendations, which can contribute to mental illnesses such as anxiety and depression. Caffeine is one of the factors that can disrupt sleep and has been linked to mental health problems as well. The aim of this cross-sectional study was to investigate whether there was a relationship between sleep quality, caffeine consumption, and mental health among 195 Icelandic adolescents, as well as if caffeine consumption mediated the relationship between sleep quality and mental health. Correlation and mediation analyses were used. Results showed a significant relationship between sleep quality and depression as well as between sleep quality and anxiety, with worse sleep quality resulting in more depression and anxiety. There was a non-significant relationship between sleep quality and caffeine consumption. Caffeine did not have a significant relationship with anxiety or depression. According to the findings, caffeine consumption did not mediate the relationship between sleep quality and depression, nor did it mediate the relationship between sleep quality and anxiety. It was therefore concluded that sleep affects adolescents' mental health, but caffeine consumption does not. Keywords: Adolescents, sleep quality, depression, anxiety, caffeine","abstract_has_math":false,"creators":["Alma Einarsdóttir 2000-","Mist Tinganelli 2000-"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Háskólinn í Reykjavík"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-06-01T08:47:26Z","date_published":"2023-06-01T08:47:26Z","updated_at":"2026-07-27T20:41:33Z","subjects":["Sálfræði","Unglingar","Svefn","Þunglyndi","Kvíði","Koffín","Psychology","Adolescents","Sleep","Depression","Anxiety","Caffeine"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1946/44626","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Háskólinn í Reykjavík"]},{"key":"dc:creator","label":"Author","values":["Alma Einarsdóttir 2000-","Mist Tinganelli 2000-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2023-06-01T08:47:25Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2023-06-01T08:47:25Z"]},{"key":"dc:date.issued","label":"Date","values":["2023-06-01T08:47:26Z"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sálfræði","Unglingar","Svefn","Þunglyndi","Kvíði","Koffín","Psychology","Adolescents","Sleep","Depression","Anxiety","Caffeine"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1946/44626"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Sleep is essential for people’s health and well-being, especially for adolescents, who undergo many physical and mental changes. Many adolescents do not follow sleep recommendations, which can contribute to mental illnesses such as anxiety and depression. Caffeine is one of the factors that can disrupt sleep and has been linked to mental health problems as well. The aim of this cross-sectional study was to investigate whether there was a relationship between sleep quality, caffeine consumption, and mental health among 195 Icelandic adolescents, as well as if caffeine consumption mediated the relationship between sleep quality and mental health. Correlation and mediation analyses were used. Results showed a significant relationship between sleep quality and depression as well as between sleep quality and anxiety, with worse sleep quality resulting in more depression and anxiety. There was a non-significant relationship between sleep quality and caffeine consumption. Caffeine did not have a significant relationship with anxiety or depression. According to the findings, caffeine consumption did not mediate the relationship between sleep quality and depression, nor did it mediate the relationship between sleep quality and anxiety. It was therefore concluded that sleep affects adolescents' mental health, but caffeine consumption does not. Keywords: Adolescents, sleep quality, depression, anxiety, caffeine","Svefn er nauðsynlegur fyrir almenna heilsu einstaklinga, þá sérstaklega fyrir ungmenni sem eru að ganga í gegnum miklar líkamlegar og andlegar breytingar. Mörg ungmenni fara ekki eftir svefnráðleggingum sem getur leitt til verri geðheilsu, t.d. kvíða og þunglyndis. Koffín er eitt af því sem getur truflað svefn og hefur einnig verið tengt við verri geðheilsu. Markmið þessarar þversniðsrannsóknar var að rannsaka hvort samband væri milli svefngæða, koffínneyslu og andlegrar heilsu 195 íslenskra ungmenna. Einnig hvort koffín miðlaði sambandinu milli svefngæða og andlegrar heilsu. Notast var við fylgni og miðlun. Niðurstöður sýndu marktækt samband milli svefngæða og þunglyndis og einnig milli svefngæða og kvíða, þar sem verri svefngæði leiða til meira þunglyndis og kvíða. Það fannst ómarktækt samband milli svefngæða og koffínneyslu. Ekki fannst marktækt samband milli koffíns og kvíða, eða þunglyndis. Samkvæmt þessum niðurstöðum þá miðlaði koffínneysla hvorki sambandinu milli svefngæða og þunglyndis, né svefngæða og kvíða. Þar af leiðandi var ályktað að svefn hafi áhrif á andlega heilsu ungmenna en ekki koffínneysla. Lykilorð: Ungmenni, svefngæði, þunglyndi, kvíði, koffín"]},{"key":"dc:title","label":"Title","values":["The relationship between caffeine, sleep, and mental health in Icelandic adolescents"]}]}],"canonical_facts":{"dc:contributor":["Háskólinn í Reykjavík"],"dc:creator":["Alma Einarsdóttir 2000-","Mist Tinganelli 2000-"],"dc:date.accessioned":["2023-06-01T08:47:25Z"],"dc:date.available":["2023-06-01T08:47:25Z"],"dc:date.issued":["2023-06-01T08:47:26Z"],"dc:description.abstract":["Sleep is essential for people’s health and well-being, especially for adolescents, who undergo many physical and mental changes. Many adolescents do not follow sleep recommendations, which can contribute to mental illnesses such as anxiety and depression. Caffeine is one of the factors that can disrupt sleep and has been linked to mental health problems as well. The aim of this cross-sectional study was to investigate whether there was a relationship between sleep quality, caffeine consumption, and mental health among 195 Icelandic adolescents, as well as if caffeine consumption mediated the relationship between sleep quality and mental health. Correlation and mediation analyses were used. Results showed a significant relationship between sleep quality and depression as well as between sleep quality and anxiety, with worse sleep quality resulting in more depression and anxiety. There was a non-significant relationship between sleep quality and caffeine consumption. Caffeine did not have a significant relationship with anxiety or depression. According to the findings, caffeine consumption did not mediate the relationship between sleep quality and depression, nor did it mediate the relationship between sleep quality and anxiety. It was therefore concluded that sleep affects adolescents' mental health, but caffeine consumption does not. Keywords: Adolescents, sleep quality, depression, anxiety, caffeine","Svefn er nauðsynlegur fyrir almenna heilsu einstaklinga, þá sérstaklega fyrir ungmenni sem eru að ganga í gegnum miklar líkamlegar og andlegar breytingar. Mörg ungmenni fara ekki eftir svefnráðleggingum sem getur leitt til verri geðheilsu, t.d. kvíða og þunglyndis. Koffín er eitt af því sem getur truflað svefn og hefur einnig verið tengt við verri geðheilsu. Markmið þessarar þversniðsrannsóknar var að rannsaka hvort samband væri milli svefngæða, koffínneyslu og andlegrar heilsu 195 íslenskra ungmenna. Einnig hvort koffín miðlaði sambandinu milli svefngæða og andlegrar heilsu. Notast var við fylgni og miðlun. Niðurstöður sýndu marktækt samband milli svefngæða og þunglyndis og einnig milli svefngæða og kvíða, þar sem verri svefngæði leiða til meira þunglyndis og kvíða. Það fannst ómarktækt samband milli svefngæða og koffínneyslu. Ekki fannst marktækt samband milli koffíns og kvíða, eða þunglyndis. Samkvæmt þessum niðurstöðum þá miðlaði koffínneysla hvorki sambandinu milli svefngæða og þunglyndis, né svefngæða og kvíða. Þar af leiðandi var ályktað að svefn hafi áhrif á andlega heilsu ungmenna en ekki koffínneysla. Lykilorð: Ungmenni, svefngæði, þunglyndi, kvíði, koffín"],"dc:identifier.uri":["http://hdl.handle.net/1946/44626"],"dc:language.iso":["en"],"dc:subject":["Sálfræði","Unglingar","Svefn","Þunglyndi","Kvíði","Koffín","Psychology","Adolescents","Sleep","Depression","Anxiety","Caffeine"],"dc:title":["The relationship between caffeine, sleep, and mental health in Icelandic adolescents"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:41:33Z"}