The Shocking Connection Between Vitamin D & Sleep - With Dr. Stasha Gominak

What It Covers

Neurologist Stasha Gominak explains how vitamin D functions as a steroid hormone — not a vitamin — that directly regulates sleep through brain stem receptors and acetylcholine production. Her clinical research reveals that vitamin D supplementation alone fails long-term without microbiome restoration, and that B vitamin deficiency underlies many chronic sleep and pain disorders.

Key Questions Answered

• •Vitamin D as hibernation hormone: Vitamin D operates as a cecosteroid hormone, not a vitamin, binding to receptors in the brain stem to produce acetylcholine — the neurotransmitter that drives daytime focus and enables deep sleep phases at night. When blood levels drop below 40 ng/mL, the body exits its normal biological sleep pathway entirely, producing the disordered sleep patterns seen in sleep clinic studies worldwide.
• •Gene expression and dosing: Research shows that vitamin D dose directly scales gene expression: 2,000 IU activates roughly 50 genes, 5,000 IU activates 500 genes, and 10,000–11,500 IU activates up to 2,000 genes. Blood levels reflect only leftover circulating D — severely deficient individuals may absorb large doses with minimal blood level rise because every cell is actively consuming it, making regular level monitoring essential.
• •Two-year supplementation failure pattern: Patients who supplemented with vitamin D alone improved initially but relapsed at the two-year mark, developing joint pain, worsening sleep, and IBS symptoms. This occurs because vitamin D increases cellular repair demand, depleting B vitamins that a compromised microbiome cannot adequately produce. Supplementing D without simultaneously restoring the microbiome creates a compounding B vitamin deficiency state.
• •B vitamin protocol for microbiome restoration: Gominak recommends pairing vitamin D supplementation with a B-100 complex — containing 100mg of all eight B vitamins — for approximately three months to create a bacterial growth environment in the gut. When the microbiome recovers and begins producing B vitamins independently, the body signals excess through returning insomnia or pain. At that point, reduce to B-50 or stop entirely.
• •B5 pantothenic acid and autonomic regulation: Pantothenic acid (B5) is the precursor to coenzyme A, which produces cortisol and regulates the autonomic nervous system — directly governing heart rate variability, parasympathetic tone, and sleep depth. Dosing is highly sensitive: 400mg caused agitation and insomnia in most patients, while 100mg (within B-100 complex) resolved pain and improved sleep. Excess B5 can destabilize sleep as severely as deficiency.
• •Sun exposure over supplementation: Prioritizing outdoor time — even without direct skin-to-sun contact — delivers a spectrum of wavelengths that supplementation cannot replicate. Vitamin D production requires UVB light directly on skin, with August producing significantly more than March or October. For those supplementing, monthly self-ordered blood level testing is recommended in the US, since physicians are currently being advised against routine vitamin D testing despite its clinical relevance.