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This review aims to describe sleep problem rates and prevalence, sleep pattern disruption, sleep duration, sleep quality, insomnia symptoms, psychological and socio\u2010economic factors affecting sleep of undergraduates in 22 countries. A systematic search for articles published from 2020 to 2021 using \u2018COVID\u201019,\u2019 \u2018Coronavirus,\u2019 \u2018Pandemic,\u2019 \u2018Sleep,\u2019 \u2018Mental Health,\u2019 and \u2018Students\u2019 from PubMed, Scopus, and Cochrane yielded 2550 articles, where 72 were included. Selection criteria were: English full\u2010text available articles, undergraduates and not postgraduates, reported sleep outcomes, and participants not from allied health courses. Risk of bias was assessed using various Joanna Briggs Institute checklists and outcomes were descriptively synthesized. Prevalence of sleep problems was notable, while longitudinal studies showed increased rates. There was significantly increased sleep duration, and sleep pattern disruption during lockdowns. Several psychological, behavioural, environmental, demographic, and socio\u2010economic factors were found to be associated with sleep changes. These highlight the pandemic's impact on sleep of undergraduate students and reveal opportunities for institutions to intervene with policies and programs to promote the well\u2010being of undergraduates. Limitations include recall bias and underrepresentation of other countries. 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