A new Canadian study has found that older people with insomnia are at greater risk of developing memory decline and long-term cognitive impairment such as dementia. The researchers compared completed self-reported evaluations of sleep and memory and neuropsychological testing in several cognitive domains from 2019 and a follow-up in 2022. Participants who reported worsening sleep quality in that three-year interval also had greater odds of reporting subjective memory decline. All of these are considered risk factors for cognitive decline and dementia. Insomnia disorder increases the risk of subjective memory decline in middle-aged and older adults: a longitudinal analysis of the Canadian Longitudinal Study on Aging.