Sleepless nights may raise dementia risk by 40%, Mayo Clinic reveals

Chronic insomnia may do more than leave you groggy, it could speed up brain aging. A large Mayo Clinic study found that people with long-term sleep troubles were 40% more likely to develop dementia or cognitive impairment, with brain scans showing changes linked to Alzheimer’s. Those reporting reduced sleep showed declines comparable to being four years older, while certain genetic risk carriers saw even steeper drops.