A large, long-term U.S. study has linked chronic insomnia in older adults to brain changes that increase the risk of dementia. Amyloid buildup and silent blood-vessel damage appear to be worsened by repeated sleepless nights, nudging the brain toward cognitive decline. Learn more in our full editorial policy© 2025 Naija247news Media Group LLC. Naija247news Media Group LLC is committed to ethical, independent journalism that serves the public interest. Learn more in our full editorial policy here © 2025 Naija247news Media Group LLC.