CONTEXT: Increasing evidence suggests that circadian and sleep parameters influence cognitive function with aging. OBJECTIVE: To evaluate observational studies of sleep duration and cognition in older adults. DATA SOURCES: A systematic review of OVID Medline and PsycINFO through September 2015, and review of bibliographies from studies identified. STUDY SELECTION: English-language articles reporting observational studies of sleep duration and cognitive function in older populations. DATA EXTRACTION: Data extraction by 2 authors using predefined categories of desired information. RESULTS: Thirty-two studies met our inclusion criteria, with nearly two-thirds published in the past 4 years. One-third of studies indicated that extreme sleep durations were associated with worse cognition in older adults. More studies favored an association with long vs. short sleep durations (35 vs. 26% of studies, respectively). Four studies found that greater changes in sleep duration over time were related to lower cognition. Study design and analytic methods were very heterogeneous across studies; therefore, meta-analysis was not undertaken. LIMITATIONS: We reviewed English-language manuscripts only, with a qualitative summary of studies identified. CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS: Observational studies of sleep duration and cognitive function in older adults have produced mixed results, with more studies suggesting that long (rather than short) sleep durations are related to worse cognition. Studies more consistently indicate that greater changes in sleep duration are associated with poor cognition. Future studies should be prospectively designed, with objective sleep assessment and longer follow-up periods; intervention studies are also needed to identify strategies for promoting cognitive health with aging.
CONTEXT: Increasing evidence suggests that circadian and sleep parameters influence cognitive function with aging. OBJECTIVE: To evaluate observational studies of sleep duration and cognition in older adults. DATA SOURCES: A systematic review of OVID Medline and PsycINFO through September 2015, and review of bibliographies from studies identified. STUDY SELECTION: English-language articles reporting observational studies of sleep duration and cognitive function in older populations. DATA EXTRACTION: Data extraction by 2 authors using predefined categories of desired information. RESULTS: Thirty-two studies met our inclusion criteria, with nearly two-thirds published in the past 4 years. One-third of studies indicated that extreme sleep durations were associated with worse cognition in older adults. More studies favored an association with long vs. short sleep durations (35 vs. 26% of studies, respectively). Four studies found that greater changes in sleep duration over time were related to lower cognition. Study design and analytic methods were very heterogeneous across studies; therefore, meta-analysis was not undertaken. LIMITATIONS: We reviewed English-language manuscripts only, with a qualitative summary of studies identified. CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS: Observational studies of sleep duration and cognitive function in older adults have produced mixed results, with more studies suggesting that long (rather than short) sleep durations are related to worse cognition. Studies more consistently indicate that greater changes in sleep duration are associated with poor cognition. Future studies should be prospectively designed, with objective sleep assessment and longer follow-up periods; intervention studies are also needed to identify strategies for promoting cognitive health with aging.
Authors: Kristine Yaffe; Ilya Nasrallah; Tina D Hoang; Diane S Lauderdale; Kristen L Knutson; Mercedes R Carnethon; Lenore J Launer; Cora E Lewis; Stephen Sidney Journal: Sleep Date: 2016-09-01 Impact factor: 5.849
Authors: Philip B Gorelick; Karen L Furie; Costantino Iadecola; Eric E Smith; Salina P Waddy; Donald M Lloyd-Jones; Hee-Joon Bae; Mary Ann Bauman; Martin Dichgans; Pamela W Duncan; Meighan Girgus; Virginia J Howard; Ronald M Lazar; Sudha Seshadri; Fernando D Testai; Stephen van Gaal; Kristine Yaffe; Hank Wasiak; Charlotte Zerna Journal: Stroke Date: 2017-09-07 Impact factor: 7.914
Authors: Hyeon Jin Kim; Regina E Y Kim; Soriul Kim; Sol Ah Kim; Song E Kim; Seung Ku Lee; Hyang Woon Lee; Chol Shin Journal: J Clin Sleep Med Date: 2021-05-01 Impact factor: 4.062
Authors: Élen Dos Santos Alves; Sofia Cristina Iost Pavarini; Bruna Moretti Luchesi; Ana Carolina Ottaviani; Juliana de Fátima Zacarin Cardoso; Keika Inouye Journal: Rev Lat Am Enfermagem Date: 2021-06-28