Health & the body
The glymphatic system: how the brain washes itself during sleep
11 min
Only discovered in 2012, the brain's waste-clearance network flushes out toxins — including proteins tied to Alzheimer's — most actively during deep sleep. Explore this newly understood plumbing and what it means for why we sleep.
Listen on the app, request early access:
Show notes
Brain cell gaps expand by sixty percent during deep sleep to allow fluid to wash away metabolic waste.
The glymphatic system uses perivascular spaces as tunnels to pump cerebrospinal fluid through brain tissue.
Norepinephrine levels must drop for the brain to trigger cellular shrinkage and initiate the nightly cleaning process.
Side-sleeping may be the most efficient physical position for clearing debris and toxins from the brain.
Sleep deprivation prevents perivascular drainage channels from opening, leading to the accumulation of amyloid-beta and tau proteins.
Arterial pulsations act as a mechanical engine to drive the flow of fluid through the brain's plumbing.
In this episode
- 1Intro1 min
- 2The Discovery of the Hidden Plumbing2 min
- 3The Mechanics of the Nightly Wash3 min
- 4The Alzheimer's Connection3 min
- 5Optimizing the Brain Drain2 min
- 6Outro1 min
Sources
- The glymphatic system clears amyloid beta and tau from brain to plasma in humans | Nature Communications
- The brain's cleanup crew works while we sleep - Harvard Health
- Why is sleep so important? Your brain depends on it
- Glymphatic System: What It Is, Function & How It Works
- The Glymphatic system: A dynamic regulator of brain health and therapeutic target - ScienceDirect
- Glymphatic system impairment in neurological disorders: potential mechanisms and therapeutic targets | Molecular Biomedicine | Springer Nature Link
- The Glymphatic System: A Novel Component of Fundamental Neurobiology | Journal of Neuroscience
- Brain Drain - PMC
- The glymphatic system: an update - ean.org
- How Your Brain Cleans Itself During Sleep | Henry Ford Health
- Sleep Drives Metabolite Clearance from the Adult Brain - PMC
- The Glymphatic System in Central Nervous System Health and Disease: Past, Present, and Future | Annual Reviews
- The glymphatic system in CNS health and disease: past, present and future - PMC
- A Paravascular Pathway Facilitates CSF Flow Through the Brain Parenchyma and the Clearance of Interstitial Solutes, Including Amyloid β - PMC
- The Glymphatic System: A Novel Component of Fundamental Neurobiology - PMC
- The Glymphatic Pathway: Waste Removal from the CNS via Cerebrospinal Fluid Transport - PMC
- Norepinephrine-mediated slow vasomotion drives glymphatic clearance during sleep: Cell
- The Glymphatic System in Humans: Investigations With Magnetic Resonance Imaging - PMC
- The glymphatic system clears amyloid beta and tau from brain to plasma in humans
- Glymphatic and lymphatic communication with systemic responses during physiological and pathological conditions in the central nervous system | Communications Biology
Fylom generates episodes like this on any topic you're curious about.
Fylom episodes are researched and written by AI. Automated checks help catch inaccuracies, but episodes aren't reviewed by a human and AI can still get things wrong. Treat them as a starting point, not a source of record — more in our accuracy disclaimer.