title: Longer self-reported sleep duration is associated with decreased performance on the montreal cognitive assessment in older adults.
abstract: BACKGROUND
  Previous studies investigating the relationship between sleep duration and cognitive function in older adults have suggested that longer sleep durations are associated with decreased cognitive performance.
  
  
  OBJECTIVE
  The intent of this study is to determine if performance on the Montreal Cognitive Assessment (MoCA) and the Mini Mental State Exam (MMSE) is associated with self-reported sleep duration in older adults.
  
  
  METHODS
  Data from 189 cognitively normal older adults aged 75 and older (mean age 89.29 ± 7.62) and free of severe depression were used for this analysis. Individuals were grouped based on their self-reported hours of sleep (short duration = <7, normal duration = 7, >9, and long duration = ≥9). The Kruskal-Wallis test was used to discern group differences on the MoCA scores, while multinomial logistic regression was used to assess the association between MoCA and MMSE scores and sleep group.
  
  
  RESULTS
  The long duration group had significantly lower MoCA scores than the normal duration group (p = 0.02). The short duration group was not significantly different from the normal duration group (p = 0.33). Individuals in the short duration group were more likely to have higher MoCA scores than those in long duration group after adjusting for age, gender, and presence of depressive symptoms [OR 0.86, 95 % CI (0.76, 0.98), p = 0.02].
  
  
  CONCLUSIONS
  The results of this study suggest that in a group of non-demented, very old subjects, self-reported sleep duration of nine or more hours is associated with decreased cognitive performance on the MoCA in older adults, even after accounting for age, gender, and presence of depressive symptoms.
authors.affiliation: Center for Healthy Aging, Banner Sun Health Research Institute, 10515 W. Santa Fe Drive, Sun City, AZ, 85351, USA. michael.ahmadi@bannerhealth.com.
authors.forename: Michael
authors.identifier: http://orcid.org/0000-0001-9901-3650
authors.initials: M
authors.lastname: Malek-Ahmadi
authors.affiliation: Center for Healthy Aging, Banner Sun Health Research Institute, 10515 W. Santa Fe Drive, Sun City, AZ, 85351, USA.
authors.forename: Krishna
authors.initials: K
authors.lastname: Kora
authors.affiliation: Center for Healthy Aging, Banner Sun Health Research Institute, 10515 W. Santa Fe Drive, Sun City, AZ, 85351, USA.
authors.forename: Kathy
authors.initials: K
authors.lastname: O'Connor
authors.affiliation: Center for Healthy Aging, Banner Sun Health Research Institute, 10515 W. Santa Fe Drive, Sun City, AZ, 85351, USA.
authors.forename: Sharon
authors.initials: S
authors.lastname: Schofield
authors.affiliation: College of Nursing and Health Innovation, Arizona State University, 530 N. 3rd St., Phoenix, AZ, 85004, USA.
authors.forename: David
authors.initials: D
authors.lastname: Coon
authors.affiliation: Center for Healthy Aging, Banner Sun Health Research Institute, 10515 W. Santa Fe Drive, Sun City, AZ, 85351, USA.
authors.forename: Walter
authors.initials: W
authors.lastname: Nieri
mesh_terms: D000369:Aged, 80 and over; D003071:Cognition; D060825:Cognitive Dysfunction / Q000175:diagnosis / Q000209:etiology; D003863:Depression / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007361:Intelligence Tests; D008297:Male; D057566:Self Report; D012890:Sleep; D012893:Sleep Wake Disorders / Q000150:complications / Q000523:psychology; D013223:Statistics as Topic; D013997:Time Factors
keywords: Aged 80 and over; Cognition; Cognitive decline; Geriatrics