# Narration and storyboard draft: Glymphatic Clearance Hypothesis

Authored draft, approximately60–90seconds; no rendered video claimed.

Brain fluid transport is real, and experiments show that water channels, vascular movement and sleep state can affect it. The stronger claim is that sleep-dependent glymphatic clearance drives ordinary human neurodegeneration. Different experiments do not always agree. One small-dye study found less clearance during sleep, while a later experiment linked transport to brief noradrenergic oscillations rather than total sleep duration. Human amyloid concentrations also reflect production, not just export. A new device study modeled fluid behavior but did not show a significant overall difference in overnight plasma biomarker changes. Our Gamma rating applies to the human disease link; narrower transport findings score higher. The next decisive test must measure production and net export separately, selectively engage the pathway, and follow durable neuronal or functional outcomes.

1. Show the exact claim, grade and confidence.
2. Show selected publication milestones; label experimental systems and clinical endpoints.
3. Contrast the strongest result with its source-specific limitation.
4. End with the boundary experiment and primary-source links.

Use authored schematics; do not depict Consensus meters as causal confidence or reproduce publisher graphics without appropriate permission.