Frontiers in molecular neuroscienceOct 31, 2026

Long-term sleep schedule disruption in military personnel may increase risk of brain inflammation

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Nov 2, 2026

Abstract

Circadian misalignment may increase vulnerability to cognitive dysfunction and mood disturbances in military personnel.

Chronic circadian disruption is proposed as a potential contributor to neuroinflammatory risk rather than just a secondary effect.
Military personnel face predictable circadian stressors, including irregular schedules and sleep restriction.
Disruption of core clock gene regulation affects mitochondrial function and redox balance.
These molecular changes can create a pro-inflammatory environment and impair neuroimmune balance.
Compromised synaptic plasticity and blood-brain barrier integrity are associated with these disruptions.
Reconceptualizing circadian misalignment as a modifiable risk factor could influence future research and interventions.

Simplified

Circadian rhythm disruption is increasingly recognized as a key contributor to neurological disorders; however, its role is often viewed as a secondary consequence rather than a primary driver of brain dysfunction. We argue that chronic circadian misalignment should be reconceptualized as a potential, modifiable contributor to neuroinflammatory risk, rather than viewed solely as a secondary consequence. Military personnel represent a unique and underutilized human model in this context, as they are chronically exposed to predictable circadian stressors, including irregular training schedules, overseas travel, sleep restriction, and pre-operational stress. At the molecular level, circadian misalignment disrupts core clock gene regulation (e.g., CLOCK, BMAL1), leading to downstream alterations in mitochondrial function and redox homeostasis. These changes promote a sustained pro-inflammatory milieu, impair neuroimmune balance, and compromise synaptic plasticity and blood-brain barrier integrity. We propose that these mechanisms collectively increase vulnerability to cognitive dysfunction and mood disturbances, even in otherwise healthy and physically fit populations. Thus, circadian misalignment in military personnel is not merely a byproduct of performance demands, but a biologically plausible contributor to brain dysfunction that warrants targeted intervention and further mechanistic study. Reframing circadian disruption as a potential, modifiable neurobiological risk factor has significant implications for both research and practice.

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Long-term sleep schedule disruption in military personnel may increase risk of brain inflammation

Abstract

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