Poor sleep and cognitive decline: the evidence mounts

A slew of papers published this month firm up the evidence that sleep disorders predict cognitive decline in older populations.

In research published this week in Sleep, US researchers reveal a link between poor sleep quality and the development of cognitive decline over three to four years.

High levels of fragmented sleep and lower sleep efficiency (minutes asleep divided by minutes in bed) increased the odds of significant subsequent decline in executive function by 40% to 50%, the study of 3,000 men over 70 found.