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Circadian rhythm disturbances are associated with increased risk of cognitive decline and progression from MCI to dementia in elderly individuals aged 60 years and older.

This systematic review of 10 studies (5,707 participants) found that circadian dysregulation, measured via actigraphic rest-activity metrics, sleep quality parameters, and lifestyle exposures, was consistently associated with a higher risk of developing or progressing MCI and dementia in adults aged ≥60 years. The findings support a negative impact of circadian and sleep disturbances on cognitive health in the elderly.

Last updated: Jul 27, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Association between circadian rhythm disturbances and cognitive decline in the elderly: a systematic review.

observational

Lopes LG, Oliveira AS, Fingergut CC, Brito GNE, Gonzalez JVP, Donato KO, Cruz MME, Salles C · Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology (2026)

Participants: N/A
Duration: N/A
Intervention: Circadian rhythm disturbances (actigraphic metrics, sleep quality, and shift work exposure)
Outcome: Risk of development or progression of Mild Cognitive Impairment (MCI) and dementia
Effect Size: N/A
Population: Elderly individuals aged 60 years or older (5,707 eligible participants)

Result:

PubMed: 42458137DOI: 10.1007/s10072-026-09221-y

Mechanism Graph

Circadian dysregulation disrupts sleep-wake cycles and melatonin timing
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Altered rest-activity rhythms (e.g., reduced amplitude, increased fragmentation) impair neurocognitive processes
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Chronic circadian disruption may accelerate neurodegenerative pathology
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Result: Higher risk of MCI and dementia progression

Limitations

  • ⚠Systematic review design limits causal inference due to reliance on observational studies
  • ⚠Heterogeneity in circadian measurement methods and cognitive assessment tools across included studies

Frequently Asked Questions

What types of circadian disturbances were studied?▼

Three domains were assessed: actigraphic rest-activity rhythm metrics (amplitude, robustness, stability, variability, acrophase), sleep quality and architecture (efficiency, fragmentation, latency, WASO, melatonin timing), and circadian-disrupting lifestyle exposures like rotating night shift work.

How many participants were included in the review?▼

The review included 10 studies with a total of 5,731 participants, of which 5,707 were eligible for analysis.

Does this review prove that circadian disturbances cause cognitive decline?▼

No, the review shows an association but cannot prove causation due to its systematic review design and reliance on observational studies.

What population was studied?▼

The population was elderly individuals aged 60 years or older, including those with Mild Cognitive Impairment (MCI) and tracking progression to Alzheimer's disease.

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References

  1. 1.Lopes LG, Oliveira AS, Fingergut CC, Brito GNE, Gonzalez JVP, Donato KO, Cruz MME, Salles C. "Association between circadian rhythm disturbances and cognitive decline in the elderly: a systematic review.." Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology, 2026. PMID: 42458137 DOI: 10.1007/s10072-026-09221-y
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.