Brain Health

Poor Sleep Enlarges a Brain Waste-Clearance Structure Tied to Memory Loss

Researchers studying 635 cognitively healthy older adults found that poorer sleep quality was associated with a larger choroid plexus — a brain structure responsible for clearing toxic waste. A larger choroid plexus, in turn, was linked to smaller hippocampi, reduced gray matter, and larger ventricles, all signs of neurodegeneration. Reduced gray matter then correlated with worse cognitive performance. The findings suggest the choroid plexus may serve as a key biological bridge connecting poor sleep to brain shrinkage and cognitive decline. This helps explain a long-observed but poorly understood connection between sleep disruption and Alzheimer's risk, and highlights brain waste clearance as a promising target for early intervention.