Tides, Nervous Systems, and the Forces That Regulate Us All

An ancient tide moves through your body right now. Your nervous system ebbs and flows in rhythms older than thought, tuned to forces you did not choose and cannot control. Just as the ocean does not decide when the moon pulls it upward, your ability to connect, learn, and create is not just about mindset or willpower; rather, it is about the tide.

We are regulated by forces we didn't create, and understanding these forces is one of the most freeing experiences in human existence.

Light ocean waves over a pink sunset — A calm ocean under a pink sunset

THE FIRST CORRESPONDENCE

The Ocean Always Answers

The ocean does not resist the moon. It does not negotiate, procrastinate, or override gravity with positive thinking. It simply responds. The water rises because it is called, and it recedes because the call has moved on. The tide is not weak for yielding; instead, it is deeply, structurally in tune.

Your autonomic nervous system functions similarly. The balance between your sympathetic and parasympathetic branches is like a tide: one rises while the other falls, and neither is meant to dominate permanently. When danger is perceived (real or imagined), the sympathetic branch activates, flooding the body with cortisol and adrenaline, narrowing focus to the here and now. When safety is restored, the parasympathetic tide returns, relaxing muscles, slowing breathing, and reopening the space for possibilities.

Polyvagal theory, developed by neuroscientist Stephen Porges, outlines a biological structure for this tidal movement. The vagus nerve, the longest cranial nerve in the body, extends from the brainstem to the gut and functions like the moon in this inner ocean. A well-regulated vagal system allows the tides to move smoothly and return steadily to rest. Conversely, a dysregulated system causes the tide to get stuck (e.g., tense, braced, or collapsed).

What is the nature of your inner tide? What patterns do you notice? Is your environment safe enough to let it flow?

NEUROLINGUISTIC PROGRAMMING

Anchoring at the Waterline: How States Become Shores

Through the lens of neurolinguistic programming (NLP), we may entertain a profound and practical question: if your nervous system is like the tide, what determines where the waterline rests? Can that waterline be moved?

In NLP, the idea of anchoring describes this very mechanism. An anchor is a stimulus (a touch, a word, a scent, an image) that has been paired with a specific nervous system state often enough to reliably evoke that state. The connection becomes structural. The anchor becomes, neurologically speaking, like a moon: a force that draws the tide.

What often feels like magic is the result of a largely unseen process—neurons that fire together wire together. A specific song becomes associated with feelings of safety. The scent of a grandmother's kitchen becomes a symbol of peace. A lover's phrase becomes a prompt to soften and relax. These are anchors that the nervous system naturally forms, often without our conscious awareness or consent.

What NLP offers is the possibility of intentional anchoring. In other words, learning to install new moons, or new forces that call new tides. When we create somatic anchors for regulated states (resource states of groundedness, openness, or creative aliveness), we are, quite literally, giving our inner ocean a new gravitational pull to respond to.

You have been anchoring all your life. The question is whether you are anchoring to what you want to feel or merely to what you've always felt.

There is also the NLP concept of state elicitation, which holds that state precedes behavior. We don't choose our state and then become capable; instead, we become capable because something first shifts our state. This understanding reverses the common self-improvement logic: instead of trying harder from a low-tide state, we learn to shift the tide, and then act from what naturally emerges at high water.

Waves crash on a beach under a cloudy pink sunset — Waves lap on a beach under a cloudy pink sky

NEUROSCIENCE

Neuroplasticity is the Reshaping of the Shore

Every tidal system shapes its shoreline over time. The ocean erodes cliffs, deposits sand, and forms new estuaries. Water flowing consistently in a steady pattern changes the very container it moves through. Your brain does this, too. At Shadow Guide, we like to call this “the neuroscience of becoming.”

Neuroplasticity is the brain's lifelong ability to reorganize its neural pathways in response to experience, but this process doesn't occur randomly or on demand. Instead, it follows predictable tidal patterns. Specifically, the brain is most receptive to new learning and structural changes when it is in a state of alert calm—present, slightly aroused, and feeling safe enough to integrate (not flooded, frozen, or numb).

This is the high-tide period of development. Neuroscientist Daniel Siegel calls this zone the window of tolerance: the range of arousal where the higher brain stays active, the social engagement system functions, and true growth can happen. Step outside this window, into overwhelm or shutdown, and the brain switches to survival mode. Learning stops, and the creative fire burns out.

Human development depends on access to a regulated nervous system. We’re unable to reach our full potential through motivation, discipline, or sheer effort alone. We can’t think or will our way into neuroplasticity during a low tide. Instead, we can only create the conditions (e.g., relational safety, rhythmic embodied practices, attuned community) that allow the tide to come in and the shore to receive it.

ALCHEMY

The Alchemist's Ocean: Solve et Coagula

The alchemists of the medieval world encoded a rich and intricate psychology using the language of metals, fire, and transformation. Central to their work was a phrase that closely mirrors the nervous system: solve et coagula, meaning ‘dissolve and coagulate’. In other words, release what is fixed and permit it to reform into something more refined.

The ocean understands this process deeply. Each high tide dissolves the careful patterns on the shore, smoothing them out, lifting debris, and carrying loosened sediment out to sea. Each receding tide deposits new material, shapes new forms, and uncovers what was hidden beneath the water. The beach is constantly being reborn.

The alchemists grasped something that modern neuroscience is only beginning to explain: the self isn't a fixed entity. It is a process, much like an alchemical cycle, that moves between breaking apart and coming back together, with each cycle resulting in greater refinement, ability, and gold.

In alchemy, the vessel is just as important as the substance inside it. The transformation requires a container strong enough to withstand the heat of dissolution without breaking. This is what a regulated relationship offers to the nervous system—the alchemical vessel. The gathering, the circle, or the held space where the tide can come in fully because the shore itself is sturdy enough to receive it.

The alchemist does not force the gold to appear. They tend the vessel, feed the fire, and trust the stages. The tide of transformation follows its own timing.

THE LIVING PRACTICE

Learning to Live in Tidal Time

We live in a culture that expects high tide on demand. We need consistent output, constant availability, and maximum capacity at all times. The nervous system was not designed for that, nor was any tidal system. What the ocean understands (and what the body has always known) is that low tide is not the failure of high tide. They are essential partners—the exhale that makes the next inhale possible.

Learning to live with tidal rhythms involves developing a new relationship with your own capacity. This means recognizing the felt sense of a rising tide, such as the subtle expansion in your chest, the brightening of your attention, or the feeling that more is accessible, and working with it instead of ignoring it. The process also involves recognizing the receding tide, like the heaviness, narrowing, or the need to be still, and honoring it rather than feeling shame.

From a neurolinguistic perspective, this involves expanding sensory acuity or developing the inner literacy to read your own states with clarity and compassion. From a neuroscience perspective, it focuses on building interoceptive awareness: the ability to sense the body's internal signals before they escalate into overwhelm. From an alchemical perspective, it is about experiencing the phases of breaking down and coming back together, with each cycle bringing greater riches.

Most fundamentally, it is about understanding that you are deeply connected to the forces that guide you. You are made of the same rhythmic intelligence as the ocean. You rise and fall in sync with pulls you cannot always name. While this can feel like a limitation, it is your participation in something vast, ancient, and alive.

COME TO THE WATER'S EDGE

At The Sunday Shadow April gathering, we will explore these tidal rhythms together through somatic anchoring practices, collective inquiry, and the alchemical vessel of held community. You don't need to arrive at high tide. Come as you are.

What Flows and What Holds