What Causes Insomnia? Understanding the Science Behind Chronic Sleep Problems

By Guillermo Salinas Araya · June 1, 2026 · Educational Material

The concept of chronic low-grade neuroinflammation, first described in neurology journals in 2008, explains why so many adults live with unexplained fatigue, brain fog, and insomnia without finding a clear organic cause in conventional testing.

Medical Definition of Insomnia

The term insomnia refers to a clinical condition with diagnostic criteria established in recent medical literature. Understanding it requires distinguishing between the entity itself, its presentation forms, and its underlying mechanisms. Updated international guidelines have reformulated several of these criteria over the past decade, expanding what conventional clinical practice has not yet incorporated.¹

Pathophysiology: How Insomnia Develops

The pathophysiological cascade of insomnia involves multiple parallel mechanisms that feed back into one another. The single-cause hypothesis has been replaced by integrative models that recognize the interaction of several axes:²

• Endocrine-metabolic axis: altered insulin sensitivity and hepatic fat production.
• Inflammatory axis: low-grade pro-inflammatory cytokines (TNF-α, IL-6, elevated high-sensitivity CRP).
• Mitochondrial axis: respiratory chain dysfunction and increased reactive oxygen species.
• Intestinal axis: microbiome alterations, increased intestinal permeability, endotoxin translocation.
• Neuroendocrine axis: dysregulation of the hypothalamic-pituitary-adrenal axis with chronically elevated cortisol.

The simultaneous accumulation of these five impacts is what distinguishes the pathological state from the physiological state of compensatory tolerance. A patient can spend years with one or two active axes without clinical manifestation — until the convergence overwhelms adaptive mechanisms.

Clinical Signs and Symptoms

Clinical presentation is heterogeneous. In initial phases, most patients are oligosymptomatic or asymptomatic.³ Signs and symptoms that guide diagnosis include:

• Unexplained fatigue, especially after meals
• Progressive increase in waist circumference
• Skin changes (spots, tags, hair alterations)
• Sleep-wake cycle disruptions
• Neurocognitive symptoms: brain fog, difficulty concentrating, irritability
• Nonspecific laboratory findings: mildly elevated CRP, mild liver or lipid abnormalities often labeled as "high normal"
• Subtle ultrasound findings requiring targeted examination

Long-Term Health Consequences If Left Untreated

The natural history of insomnia without adequate intervention involves silent but predictable progression:⁴

• Increased cardiovascular risk independent of cholesterol
• Accelerated development of type 2 diabetes in patients with prediabetes
• Progression toward structural organ damage within 5 to 15 years
• Increased cancer risk documented in longitudinal cohorts
• Progressive functional decline that reduces quality of life and healthy life expectancy

The therapeutic opportunity window — the period during which the condition is completely reversible — is proportional to exposure time and the number of compromised pathophysiological axes. Each year lost without comprehensive intervention reduces that window.

Can It Be Reversed?

Contemporary clinical evidence is conclusive: in pre-irreversible stages, reversal is possible. But it requires addressing all five pathophysiological axes simultaneously, not sequentially or in isolation. This is where conventional approaches fail: they intervene on a single axis and leave the other four active.

The educational protocol we designed — The Salinas Method — includes 8 sequential phases. Each phase addresses a distinct mechanism in the cascade. Phases 1 and 2 prepare the cellular terrain and correct the microbiome. Phases 3 through 6 dismantle low-grade inflammation, mitochondrial dysfunction, insulin resistance, and cortisol axis disruption. Phases 7 and 8 consolidate the change and prevent recurrence.

It's not just lifestyle changes. It's not isolated strategies. It's not a single supplement. It's a guided educational protocol, step by step, based on the most recent clinical evidence and designed so the patient understands the why behind each action.

References

1. Theoharides TC, et al. Brain 'fog,' inflammation and obesity. Front Neurosci. 2015. PubMed
2. Buysse DJ. Insomnia. JAMA. 2013. PubMed
3. Bhat A, et al. Inflammation in chronic fatigue syndrome. Brain Behav Immun. 2020. PubMed
4. Riemann D, et al. European guideline for the diagnosis and treatment of insomnia. J Sleep Res. 2017. PubMed

100% educational material. Does not replace personal medical consultation. References verifiable on PubMed.