Poor sleep quality impairs cognitive performance in older adults

Abstract

SUMMARYThe prevalence of insomnia increases with age. Short sleep duration is associated with deficits in cognitive performance. We hypothesized that short sleep duration and sleep quality influence cognitive performance in older adults. The study included 78 adults aged 60 years and over (72.2 AE 5.9 years). Total sleep time and sleep efficiency (total sleep time/time in bed 9 100) were calculated using actigraphy. We evaluated cognitive performance with the continuous performance test-identical pairs and the number-back test. Sleep apnea was evaluated overnight with a portable home monitoring system. The accuracy of the 0-back test significantly decreased in participants with total sleep time less than 5 h compared with those with total sleep time greater than 7 h, but there was no significant difference in continuous performance test-identical pairs between the two groups. Participants with sleep efficiency <85% showed a significant decrease in 0-and 1-back test accuracy compared with those with sleep efficiency ! 85%. There were no significant differences in the accuracy of number-back tests and continuous performance testidentical pairs between apnea-hypopnea index ! 15 h À1 and apneahypopnea index <15 h À1 groups, or among lowest SpO 2 ! 90%, lowest 80-90%, and lowest SpO 2 < 80% groups. Age, total sleep time and sleep efficiency were significantly correlated with accuracy on the 0-back test. Age and sleep efficiency were significantly correlated with accuracy on the 1-back test. Multiple regression analysis revealed that total sleep time was independently correlated with accuracy on the 0-back test, while age was independently correlated with accuracy on the 1-back test. Our findings suggest that sleep duration and sleep quality may play a role in cognitive performance in older adults.

New perspectives on the role of melatonin in human sleep, circadian rhythms and their regulation

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Local body cooling to improve sleep quality and thermal comfort in a hot environment

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