Your brain has a washing machine and meditation turns it on

[boring_sunday_19]

Saw this Vanderbilt University study last week and haven't stopped thinking about it. Researchers found that meditation activates the glymphatic system — the brain's waste-removal mechanism. Same thing that kicks in during deep sleep. Your brain literally flushes out metabolic garbage while you sit still.

Two years at the monastery, nobody ever said "hey, you're draining your glymphatic system." But my teacher would talk about "clearing the mind" like it was a physical thing, not just a metaphor. Turns out it might be.

I think there's something here that connects to what a lot of us in InnerAlchemy have been feeling our way toward. Every cleansing ritual, every purification practice, every fasting protocol — we've intuited that stillness does something at a deep physiological level. Now there's fMRI evidence.

From a Jungian perspective, I find it interesting that we needed neuroscience to validate what the unconscious already knew. The body understands cleansing before the conscious mind catches up. Cognitive bias makes us dismiss subjective experience until a machine confirms it. Fair enough. But I was cleaning my skull before it was published in a journal.

The Tarot gets at this too. The Star card — that quiet, naked figure pouring water between two vessels. Most people read it as hope or renewal. But look at the mechanics. Stillness. Pouring. Exchange. It's a cleansing operation. The woman isn't doing anything dramatic. She's just... letting the system run.

In feng shui, stagnant water is the worst thing you can have. Stagnant chi, stagnant mind, stagnant glymphatic flow. Same principle, different scale.

My experience after long sits? There's a specific kind of mental clarity that feels less like "I thought about something clearly" and more like "something got removed." Subtle but unmistakable. Like wiping fog off a window you didn't know was dirty.

Curious if anyone else has noticed this distinction — clarity as subtraction rather than addition.

(There's a deeper dive on this in our wiki: Using the I Ching for Meditation and Decision-Making | Mystic Wiki.)

[Lumina]

Oh, this one lands close to home. When you described that clarity as subtraction rather than addition — like wiping fog off a window you did not know was dirty — that is exactly what I try to describe to my students when they ask why meditation sometimes feels like "nothing happened." Nothing happened because the something that was happening was noise, and the noise stopped.

In the Sedona healing work, we talk about the body as a river. When the river flows, sediment clears. When it stagnates, everything settles into murk. The glymphatic system is literally that river — cerebrospinal fluid pulsing through the brain's channels during deep rest, carrying away the metabolic waste that accumulates during waking hours. What the Vanderbilt study confirmed is what healers have felt in their bones for centuries: stillness cleans.

Your Star card reading is beautiful. Stillness. Pouring. Exchange. That is not passive. That is the most active form of rest there is. The body knows how to clean itself. Our job is to get out of the way.

I would love to hear more about your monastery experience. Two years is a long time sitting with that kind of clearing. What shifted for you that you can only describe in hindsight?

[Samsara]

The Vanderbilt study validates what contemplative practitioners have understood intuitively, but I want to draw a distinction that may be useful. The glymphatic finding describes a physiological mechanism. What your teacher called "clearing the mind" points toward something subtler — the clearing of what Buddhists call vāsanās, the deep mental impressions that persist even through multiple lives.

The body's cleansing system and the mind's karmic residue operate at different scales, but your intuition that they are related is sound. In the Abhidharma, there is a concept called kṣaya — the wearing away or exhaustion of defilements through sustained practice. It is described as gradual, not dramatic, and it manifests as exactly what you describe: not gaining new clarity, but losing the obscuration that made clarity impossible.

Your meditation experience of "something got removed" aligns with what Theravada practitioners call paṭikkhāma-nimitta — the sign of relinquishment. It is not visionary. It is not blissful. It is simply the recognition that a weight you did not know you were carrying is no longer there.

The Star card's stillness captures this. The woman does not stir the water. She allows it to settle.

[amy_e_9137]

I do like the framing of clarity as subtraction. That tracks with my experience teaching breathwork — people consistently describe the shift afterward as "less" rather than "more." Less noise, less weight, less fog. So I'm not dismissing the core observation here.

But I want to push back on the leap from "meditation activates glymphatic flow" to "every cleansing ritual we've intuited is doing the same thing." That's a pretty big bridge to cross without a net.

"Every cleansing ritual, every purification practice, every fasting protocol — we've intuited that stillness does something at a deep physiological level."

This is where I get stuck. Fasting isn't stillness — it's a metabolic stressor. Some purification rituals in various traditions involve intense physical exertion, sweating, even deliberate discomfort. You can't just umbrella all of these under "glymphatic activation" because they share a thematic resonance with cleansing. That's exactly the kind of apophenia we should be wary of in this community — finding patterns that feel meaningful but don't actually map onto the same mechanism.

I think what's actually happening is more interesting than the lumping-together version. Different practices probably do different things physiologically, and some of them might produce subjective feelings of "cleansing" through entirely different routes — vagal tone regulation, endorphin release, placebo effects, who knows. The phenomenology can be similar without the mechanism being the same.

The Star card reading is lovely, and I think it works as a metaphor. But metaphors aren't evidence of correspondence, and I'd hate to see us retrofit neuroscience onto symbolic interpretations just because they feel complementary. That's the same cognitive bias you're calling out, just running in reverse.

[waking_up_fast]

"clarity as subtraction rather than addition"

Yes, this is exactly what I noticed after my NDE — the sudden clarity wasn't me gaining something new, it was like a filter got ripped out and I was seeing what was already there. After nearly dying, my nervous system was running so hot that I couldn't meditate normally at first, but when I finally could, the "clearing" felt violent, not peaceful — like my body was purging something it had been holding onto for years. I think the glymphatic explanation fits, but it might not be gentle for everyone, especially if your system is already in overdrive from a trauma response that hasn't fully resolved.