“…The studies were published between 2009 and 2021 and were performed in the United States (Ensrud et al., 2009 ; Liu et al., 2021 ; Vaz Fragoso et al., 2009 ), Nepal (Devkota et al., 2017 ), Poland (Pacholek et al., 2020 ), China (Fan et al., 2022 ; Tang et al., 2021 ; Xie et al., 2021 ; Zhao et al., 2019 ), Mexico (Moreno‐Tamayo et al., 2021 ; Moreno‐Tamayo et al., 2017 ), and Turkey (Cavusoglu et al., 2021 ). All the studies included older people aged at least 60 years from the communities (Cavusoglu et al., 2021 ; Devkota et al., 2017 ; Ensrud et al., 2009 ; Fan et al., 2022 ; Liu et al., 2021 ; Moreno‐Tamayo et al., 2021 ; Moreno‐Tamayo et al., 2017 ; Pacholek et al., 2020 ; Tang et al., 2021 ; Vaz Fragoso et al., 2009 ; Xie et al., 2021 ) or nursing homes (Zhao et al., 2019 ). Diagnosis of insomnia was according to the Insomnia Severity Index (ISI) (Vaz Fragoso et al., 2009 ), Pittsburgh Sleep Quality Index (Cavusoglu et al., 2021 ; Ensrud et al., 2009 ; Tang et al., 2021 ), the Athens Insomnia Scale (AIS) (Fan et al., 2022 ; Moreno‐Tamayo et al., 2021 ; Pacholek et al., 2020 ; Zhao et al., 2019 ), or self‐reported symptoms of insomnia (Devkota et al., 2017 ; Liu et al., 2021 ; Moreno‐Tamayo et al., 2017 ; Xie et al., 2021 ), and the overall prevalence of insomnia was 6105/16895 (36.1%).…”