Article

Nighttime sleep, Chinese afternoon nap, and mortality in the elderly.

Division of Gerontology Research, National Health Research Institutes, Zhunan, Taiwan.
Sleep (impact factor: 5.05). 10/2007; 30(9):1105-10. pp.1105-10
Source: PubMed

ABSTRACT Although many epidemiologic studies have shown that both short and long nighttime sleep durations are associated with increased mortality in the general population, limited data have been reported for older persons, especially those taking afternoon nap. Data from a prospective cohort study of the elderly in Taiwan were used to examine the relationship among nighttime sleep, Chinese afternoon nap, and mortality.
Prospective cohort study.
General population.
A nationally representative sample of 3079 Taiwanese community residents aged 64 and over was studied, using reported sleep related information collected in 1993 and subsequent 10-year mortality data.
None.
Cox proportional hazards models, separated by sex, were computed to estimate mortality hazard ratios in relation to nighttime sleep duration and afternoon nap duration, adjusting for potential confounders. Compared to older adults sleeping 7-7.9 hours at night, those with longer sleeping time (> or = 10 hours in males and > or = 8 hours in females) had a significantly higher risk of total mortality. Afternoon nap alone was not associated with total mortality. When nighttime sleep duration and afternoon nap duration were considered together by adding the interaction term in the model or stratifying sleep hours and nap duration, the effect of afternoon nap on mortality risk remained insignificant.
Longer nighttime sleep duration increases mortality risk in older adults. Chinese afternoon nap is not an independent predictor of mortality. There is no significant benefit or harm of practicing afternoon nap in addition to the regular night sleep on elderly mortality.

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Keywords

3079 Taiwanese community residents
 
afternoon nap duration
 
Chinese afternoon nap
 
Cox proportional hazards models
 
duration increases mortality risk
 
elderly mortality
 
epidemiologic studies
 
general population
 
independent predictor
 
limited data
 
nap duration
 
nationally representative sample
 
older adults sleeping 7-7.9 hours
 
older persons
 
potential confounders
 
prospective cohort study
 
sleeping time
 
subsequent 10-year mortality data
 
taking afternoon nap
 
total mortality
 

Tzuo-Yun Lan