Cohen-Mansfield, Jiska and Perach, Rotem. 2012. Sleep duration, nap habits, and mortality in older persons. Sleep, 35(7), pp. 1003-1009. ISSN 0161-8105 [Article]

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Abstract or Description

OBJECTIVE

To examine the effect of nighttime sleep duration on mortality and the effect modification of daytime napping on the relationship between nighttime sleep duration and mortality in older persons.

DESIGN

Prospective survey with 20-yr mortality follow-up.

SETTING

The Cross-Sectional and Longitudinal Aging Study, a multidimensional assessment of a stratified random sample of the older Jewish population in Israel conducted between 1989-1992.

PARTICIPANTS

There were 1,166 self-respondent, community-dwelling participants age 75-94 yr (mean, 83.40, standard deviation, 5.30).

MEASUREMENTS

Nighttime sleep duration, napping, functioning (activities of daily living, instrumental activities of daily living, Orientation Memory Concentration Test), health, and mortality.

RESULTS

Duration of nighttime sleep of more than 9 hr was significantly related to increased mortality in comparison with sleeping 7-9 hr (hazard ratio [HR] = 1.31, P < 0.01) after adjusting for demographic, health, and function variables, whereas for short nighttime sleep of fewer than 7 hr mortality did not differ from that of 7-9 hr of sleep. For those who nap, sleeping more than 9 hr per night significantly increased mortality risk (HR = 1.385, P < 0.05) and shorter nighttime sleep reduced mortality significantly in the unadjusted model (HR = 0.71, P < 0.001) but only approached significance in the fully adjusted model (HR = 0.82, P = 0.054). For those who do not or sometimes nap, a short amount of sleep appears to be harmful up to age 84 yr and may be protective thereafter (HR = 1.51, confidence interval [CI] = 1.13-2.02, P < 0.01; HR = 0.76, CI = 0.49-1.17, in the fully adjusted model, respectively).

CONCLUSIONS

The findings are novel in demonstrating the protective effect of short nighttime sleep duration in individuals who take daily naps and suggest that the examination of the effect of sleep needs to take into account sleep duration per 24 hr, rather than daytime napping or nighttime sleep per se.

CITATION

Cohen-Mansfield J; Perach R. Sleep duration, nap habits, and mortality in older persons. SLEEP 2012;35(7):1003-1009.

Item Type:	Article
Identification Number (DOI):	https://doi.org/10.5665/sleep.1970
Keywords:	Sleep; mortality; old age
Departments, Centres and Research Units:	Psychology
Dates:	Date Event 1 July 2012 Published
Item ID:	24185
Date Deposited:	17 Sep 2018 11:18
Last Modified:	17 Sep 2018 11:18
Peer Reviewed:	Yes, this version has been peer-reviewed.
URI:	https://research.gold.ac.uk/id/eprint/24185

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