Poor sleep quality is associated with a 40 to 50 percent increase in the odds of clinically significant decline in executive function, which was similar in magnitude to the effect of a five-year increase in age.

"This study provides an important reminder that healthy sleep involves both the quantity and quality of sleep," said M Safwan Badr, President of American Academy of Sleep Medicine.

The study involved 2,822 community-dwelling older men at six clinical centres in the US Participants had a mean age of 76 years.

An average of five nights of objective sleep data were collected from each participant using a wrist actigraph.

Cognitive function assessment included evaluation of attention and executive function using the Trails B test.

According to the study authors, executive function is the ability for planning or decision making, error correction or trouble shooting and abstract thinking. The study appeared in the journal Sleep.


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