The Brain’s Nightly Power Wash: Cleaning Away Dementia

For decades, scientists wondered how the brain disposed of its metabolic waste without a traditional lymphatic system. This episode explores the groundbreaking discovery of the glymphatic system—a nightly "power-wash" that occurs during deep, non-REM sleep. We dive into the mechanical process of how brain cells shrink to let fluid flush out toxic proteins like amyloid-beta and tau, and why the failure of this system may be the common denominator for Alzheimer’s, Parkinson’s, and vascular dementia. From the role of heart health in driving this "brain vacuum" to the latest research on causal links, we uncover why quality sleep is the ultimate defense against neurodegeneration.