Sleep disturbances are increasingly recognized as more than a downstream symptom of aging or cognitive decline. Growing evidence points to sleep-disordered breathing, most commonly obstructive sleep apnea (OSA), as a well-supported modifiable risk factor for dementia, with longitudinal studies showing it often precedes diagnosis by years.1,2 Sleep problems also frequently precede a dementia diagnosis by years, and patients who report poor sleep are more likely to go on to develop the condition than those who sleep well.
Key Clinical Takeaways for Physicians
- Screen for sleep routinely in primary care; sleep is a core pillar of brain health.
- Consider sleep-disordered breathing, particularly obstructive sleep apnea, as a strong dementia-related risk factor.
- Recognize sleep as a central “hub” connecting metabolic dysfunction, depression, and other dementia risk factors.
- Do not normalize poor sleep as an inevitable part of aging; evaluate and treat.
- Address sleep to improve quality of life and daytime functioning now, while the long-term impact on dementia risk continues to be clarified.
Recent research has clarified why disrupted sleep may drive this risk. Deep, slow-wave sleep plays a central role in clearing amyloid and tau from the brain, 2 proteins implicated in Alzheimer disease pathology, so disrupted sleep can impair that clearance process. Sleep also intersects with other established dementia risk factors, including metabolic disturbances and depression, which can both precipitate and result from poor sleep, positioning sleep as a hub linking multiple pathways to neurodegenerative disease. Investigators are also increasingly studying multi-dimensional sleep health, examining several facets of sleep together rather than in isolation, in relation to Alzheimer disease and dementia risk.
For primary care physicians, the clinical takeaway is straightforward: ask patients about sleep. Sleep disorders such as OSA and insomnia remain underdiscussed in primary care, in part because sleep receives limited attention during medical training, yet effective interventions exist across the lifespan, including in older adults, where poor sleep is too often dismissed as an inevitable part of aging.
These findings were the focus of a session at SLEEP 2026, held June 14 to 17 in Baltimore, Maryland. In the following interview, Ruth Benca, MD, PhD, professor of psychiatry and behavioral medicine at Wake Forest University School of Medicine, and Adam P. Spira, PhD, MA, professor at the Johns Hopkins Bloomberg School of Public Health, discuss the evidence linking sleep disturbance to dementia risk and what primary care physicians should be doing about it today.
References:
- Shieu, M., Dunietz, G., Paulson, H. et al. The association between obstructive sleep apnea risk and cognitive disorders: a population-based study. J Clin Sleep Med. 2022;18:1177-1185. doi:10.5664/jcsm.9832
- bdelmessih GT, Bransby L, Cummins H, Jackson ML, Lim YY. Associations of self-reported obstructive sleep apnea with cognition and dementia risk in cognitively unimpaired middle-aged adults. Alzheimers Dement. 2026;22:e71553. doi:10.1002/alz.71553
