en Geriatric Medicine Geriatric Medicine Review Article Review Article <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><b>&nbsp;&nbsp;</b><b><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp; Background: </span></span></b><span style="font-size:9.0pt"><span style="font-style:normal">Over the past decade, research on the impact of sleep duration on cognitive domains in older adults has been emerging; however, a formal synthesis of the focused literature that addresses all cognitive domains has not yet been conducted. Therefore, this review study was conducted to investigate the effects of sleep duration on various cognitive domains in older adults.</span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp; <b>Methods:</b> This scoping review was conducted according to Arksey and O&#39;Malley (2005). A systematic search was conducted across three research databases: PubMed, Web of Science, and Scopus, with relevant gray literature also reviewed. Studies that reported on the relationship between sleep duration and cognition among older adults were included in the review. Data were extracted, charted, and synthesized into a narrative. Consistent with the purpose of a scoping review, the methodological quality of the studies was not appraised. </span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp; <b>Results:</b> A total of 23 studies published between 2009 and 2024 fulfilled the inclusion criteria. The findings revealed that both excessively long and short sleep durations were strongly linked to impairments in learning, memory, and complex attention. Only a limited number of studies explored all cognitive domains, with none addressing social cognition. Additionally, analyses considering gender differences were notably absent. </span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal">&nbsp;&nbsp; <b>Conclusion:</b> This review highlights cognitive domains affected by inadequate sleep in older adults and emphasizes the need for more research on gender-specific differences in sleep duration. It also pointed out a gap in understanding the link between sleep duration and social cognition, emphasizing the need for further studies in this area.</span></span></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="text-autospace:none"><span new="" roman="" style="font-family:" times=""><span style="font-style:italic"><span style="font-size:9.0pt"><span style="font-style:normal"></span></span></span></span></span></span></span></span><br> &nbsp; Sleep, Sleep Duration, Cognition, Domains of Cognition, Older Adults 707 728 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-9968-1&slc_lang=en&sid=1 Narges Kheirollahi nargeskheirollahi92@gmail.com 200319475328460099332 200319475328460099332 No Research Center for Integrative Medicine in Aging, Aging Research Institute, Tabriz, Iran Nafiseh Ghassab-Abdollahi nnn.gassabnnn@gmail.com 200319475328460099333 200319475328460099333 No Department of Geriatric Health, Faculty of Health, Tabriz University of Medical Sciences, Tabriz, Iran Saeed Sadigh-Eteghad Saeed.sadigetegad@gmail.com 200319475328460099334 200319475328460099334 No Research Deputy, Neurosciences Research Center (NSRC), Tabriz University of Medical Sciences, Tabriz, Iran Seyyed Mohammad Bagher Fazljou dr.fazljou@yahoo.com 200319475328460099335 200319475328460099335 No Department of Persian Medicine, School of Traditional Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Reza Mohammadinasab rmn.nasab@gmail.com 200319475328460099336 200319475328460099336 No Department of History of Medicine, School of Traditional Medicine, Tabriz University of Medical Sciences, Tabriz, Iran Nafiseh Rezaei Nafis.rezaei@yahoo.com 200319475328460099337 200319475328460099337 No Department of Medical Library and Information Sciences, School of Allied Medical Sciences, Hamadan University of Medical Sciences, Hamadan, Iran AliHossein Zeinalzadeh zeinalzadeha@tbzmed.ac.ir 200319475328460099338 200319475328460099338 Yes Social Determinants of Health Research Center, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran