Do treatments that improve sleep in people with insomnia reduce inflammatory biomarkers of disease risk?

Which insomnia treatments have been linked to lower inflammation?

The clearest signal comes from exercise. A 2025 systematic review and meta-analysis of exercise interventions for adults with chronic insomnia reported improvements in inflammatory factors, specifically IL-6 and TNF-α [3]. These are signaling molecules that the immune system uses to coordinate inflammation; chronically elevated levels are associated with higher disease risk. The review's finding suggests that exercise, as a treatment for insomnia, may do more than improve sleep—it may also shift inflammatory markers in a healthier direction.

Cognitive behavioral therapy for insomnia (CBT-I), the guideline-recommended talk therapy for insomnia, is also under investigation. A 2026 systematic review of randomized controlled trials is examining whether CBT-I can reduce biomarkers of inflammation [2]. Because this review is ongoing or recently completed, its conclusions are not yet fully established, but the question itself reflects a plausible link: if insomnia-related inflammation contributes to poorer health outcomes, then treating insomnia effectively might lower that inflammation [2].

Why would improving sleep affect inflammation?

The underlying idea is that poor sleep and inflammation are biologically intertwined. A 2021 scoping review of salivary inflammatory molecules noted that interventions which improve sleep—such as a traditional Chinese herbal medicine called Shimian granules—were associated with normalization of inflammatory changes in shift-working nurses with insomnia symptoms [4]. This observation is consistent with the broader hypothesis that sleep disturbances can dysregulate inflammatory pathways, and that reversing the sleep problem may help restore balance.

However, the evidence is not yet strong enough to say that sleep improvement directly causes inflammation to fall. The scoping review describes associations and changes observed alongside sleep improvement, not a proven causal chain [4]. Similarly, a 2025 study in insomnia mice found that a traditional decoction improved sleep and affected inflammatory markers, but animal findings do not automatically translate to people [5].

What is still unclear about sleep treatments and inflammation?

Several important questions remain open. First, it is not known whether different insomnia treatments produce similar anti-inflammatory effects. Exercise has the most direct supporting evidence so far [3], while CBT-I is still being evaluated [2], and enhanced external counterpulsation is only at the trial stage with inflammatory biomarkers as secondary outcomes [1]. Second, the magnitude of any effect—how much inflammation drops and whether that translates into meaningfully lower disease risk—is not established by the current evidence.

Third, most of the evidence comes from small or indirect studies. The exercise meta-analysis synthesizes available trials [3], but the CBT-I review's findings are not yet fully reported [2], and the salivary biomarker review is scoping in nature, mapping the territory rather than providing definitive answers [4]. The mouse study [5] and the ongoing EECP trial [1] add mechanistic and future directions but do not yet confirm that treating insomnia in people reliably reduces inflammatory disease risk.

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