Poor sleep quality associated with clinical depression for older adults
03/19/2026
Older adults with poor sleep 1.6 times more likely to have depression within 6 years.
Sleep quality contributes to more than feeling rested, it may also shape long-term mental health. New research published in Sleep Medicine found poor sleep quality for middle-aged and older adults could predict their risk of developing clinical depression in later years.
Using data from nearly 14,000 participants aged 55 to 86 years from the Canadian Longitudinal Study on Aging with no history of depression, researchers compared reported sleep and mental health data after a six year follow up.
Adults who reported poor sleep quality were 1.6 times more likely to report the onset of clinical depression at follow-up compared to those who reported being very satisfied with their sleep. Even those who were simply satisfied with their sleep were 1.2 times as likely of reporting depression compared to those who had reported they were very satisfied with their sleep.
“We’re seeing that poor sleep quality might not just be a symptom of depression, it may be a predictor of it,” said Samia Salame, Research Assistant at Bruyère Health Research Institute and the lead author of the study. “The good news is that this means improving sleep habits and hygiene is a potential way to help reduce risk of depression in older adults.”
Sleeping very little (≤ 4 hours) or very long (≥ 10 hours) was also linked with a greater likelihood of later depression than sleeping the recommended 7–8 hours. Sleep difficulties and disorder symptoms, such as trouble initiating sleep or signs of sleep apnea, also contributed to depression risk.
“Depression is one of the most common geriatric psychiatric disorders,” said Salame, who explained that late-life depression tends to be more chronic and recurrent compared to depression in midlife. “Given depression can be an early sign of cognitive decline and serves as a risk predictor of more serious conditions such as dementia, early detection and management can help prevent or delay more serious health effects for aging adults.”
*This study was funded in part by the Canadian Institutes of Health Research.