Vitamin D, Sleep, and Your Gut: A Neurologist's Case

Dr. Stasha Gominak spent over two decades as a neurologist before she left clinical practice to tell anyone who would listen that the way we think about sleep—and the vitamins we take for it—is probably wrong. Not a little wrong. Fundamentally wrong.

Her argument, which she's published in two papers and built into a method she now teaches called RightSleep, goes roughly like this: the epidemic of bad sleep isn't a behavior problem. It's a chemistry problem. And the chemistry problem traces back, in her view, to the fact that we stopped living outside.

That's the thesis, and it's worth taking seriously—not because it's proven, but because the underlying mechanism she describes is coherent, the clinical observations are striking, and the mainstream medical response to the question has been, at best, unsatisfying.

The brain stem nobody talks about

Gominak's entry point into all of this was a strange pattern she kept seeing in sleep studies. Her patients—mostly young, otherwise healthy women coming to her for chronic headaches—were missing REM sleep. Not reduced REM. Missing it almost entirely in the first half of the night, when it should be most abundant.

REM sleep, she explains, is when the body becomes fully paralyzed. The brain stem—that ancient, unglamorous structure sitting at the base of everything—runs the whole show while you're unconscious. It controls your heart rate, blood pressure, the cycling between sleep stages. The parasympathetic nervous system (rest and digest; the opposite of fight-or-flight) is supposed to dominate the second half of the night, roughly 3am onward. Her patients weren't making that transition.

"When our D goes very low, our brain actually forgets how to sleep," she says. "That's the easiest way to describe it."

The connection to vitamin D came through researcher Walter Stumpf, who had spent decades documenting vitamin D receptors throughout the brain stem—including in the exact nuclei that regulate sleep transitions and paralysis during REM. When Gominak searched PubMed in 2009 for "vitamin D and sleep," she found nothing. But when she searched "vitamin D in the brain," she found Stumpf's work, called him up, and started connecting dots.

The biochemical chain she traces: vitamin D activates receptors in brain stem cells, which express an enzyme called choline acetyltransferase, which produces acetylcholine, the neurotransmitter the parasympathetic system runs on. No adequate vitamin D, no adequate acetylcholine, no proper REM sleep architecture. The body's nightly repair system—which the glymphatic research has since made famous—doesn't get fully activated.

This is where it gets interesting, because the mechanism isn't wild speculation. Vitamin D receptors in the brain stem are documented. The acetylcholine pathway is documented. The question is whether the clinical dots Gominak connects actually hold up at scale, and that's where mainstream medicine and Gominak part ways.

The B vitamin complication

Here's what Gominak did not expect: vitamin D supplementation, over time, appeared to create new problems in her patients. Joint pain. Burning in the hands and feet. Symptoms that showed up roughly two years after people started taking D on its own.

Her explanation draws on the gut microbiome. The eight B vitamins, she argues, are primarily produced not from food but by gut bacteria—they were originally described in the scientific literature as bacterial growth factors, chemicals bacteria produce and share with each other and with us. If your microbiome is compromised (and she argues that widespread indoor living, sunscreen use, and antibiotic exposure since the 1980s have compromised everyone's to some degree), you're not getting adequate B vitamins regardless of what you eat.

Vitamin D, she says, is one of the inputs the microbiome needs to function properly. When you start supplementing with D, the body ramps up repair processes that have been stalled—and those processes consume B vitamins faster than a dysbiotic gut can produce them. The D didn't directly deplete the B vitamins; it exposed the microbiome's inability to keep up with demand.

"The vitamin world is giving the wrong advice," she says. "If you do not know what you're doing with them, they're just as dangerous as any drug you could put in your mouth."

It's worth being clear: this specific mechanism—vitamin D supplementation leading to B vitamin deficiency via microbiome disruption—is not established scientific consensus. The mainstream position is that low vitamin D and low B12 frequently co-occur because they share common causes (poor gut absorption, aging, dietary restriction), not because one drives the other. Gominak is aware of this. Her published hypothesis, from 2016, frames it explicitly as a hypothesis, and she acknowledges in the interview that the intermediary links are more complicated than any single causal story can capture.

What she observed in her patient population, though, was that adding B vitamins—specifically a B-complex supplement for a limited period—resolved the new symptoms. And when she stopped the B supplementation after several months, patients' guts appeared to have recovered enough to take over production. The goal, in her framing, was never permanent supplementation but a temporary reseeding of the conditions the microbiome needs to restore itself.

"It is my belief that if all of this happens spontaneously in every other animal on the planet, then we shouldn't have to take supplements either," she says. "The squirrels are not going to GNC."

Where the resistance lives

The methodological friction here is real and worth understanding. Most vitamin D research uses fixed doses without measuring blood levels—giving everyone, say, 4,000 IU regardless of their baseline, their sun exposure, or the time of year. Gominak argues that D behaves like a hormone, not a vitamin, and that hormones need to be managed to blood levels in a narrow target range. Too much and too little both produce problems; the body doesn't respond to overage and underage with different signals—it just stops sleeping properly either way.

That methodological critique is legitimate. Hormone research does generally track blood levels. The RCT infrastructure for vitamin D has historically not done this, and some researchers have flagged exactly this limitation.

Gominak reads the gap between the available research and the clinical reality of her patients as institutional caution functioning as willful incuriosity. Whether that's a fair characterization of how medical guidance gets formed is its own argument. What's not deniable is that the current system leaves a lot of people without answers, which is exactly why they end up in two-hour podcast conversations hoping a retired neurologist from Texas has figured something out.

What to actually do with this

If you came here looking for a supplement protocol, I'm going to disappoint you—not to be coy but because Gominak herself is emphatic that unguided supplementation in this space is how people end up worse than when they started. Any changes to vitamin D, B vitamins, or related supplementation warrant a conversation with a clinician who can actually run blood work and monitor levels.

What's genuinely valuable about Gominak's framework isn't any specific protocol. It's the underlying reframe: sleep disorders aren't primarily behavioral failures, and fixing them isn't primarily a matter of trying harder with your bedtime routine. The behavioral stuff—consistent sleep times, darkness, temperature—is real and useful, but it operates on a foundation of neurochemistry. If the foundation is broken, the behavioral layer floats on nothing.

"The usual sleep treatment is behavioral," she says. "Blackout curtains, white noise, go to bed at the same time. That is not something that's helped the people who wind up with me. They've tried all that. They've tried everything."

There's something in that worth sitting with. The people who land in a neurologist's office with years of failed sleep hygiene attempts aren't there because they haven't tried hard enough. They're there because the framework they were given was missing a floor.

Whether vitamin D and gut bacteria constitute that missing floor is still an open question. Gominak's work sits at the boundary of clinical observation and peer-reviewed consensus, which is either where the most important ideas live or where motivated reasoning runs free—and usually you can't tell which until years later.

What I'd hold onto is the question she keeps asking: if sleep is when the body repairs everything, what happens to all the things that need repairing when the sleep never gets deep enough?

That question doesn't require any particular theory to be correct. It just requires you to take sleep seriously enough to ask what's actually running it.

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Ellis Redmond is Buzzrag's Personal Development & Productivity Correspondent.