Plain-English Summary
Sleep Regularity Mortality studied sleep regularity in UK Biobank participants with wrist accelerometer data. Higher sleep regularity was associated with a 20% to 48% lower risk of all-cause mortality across the top four SRI quintiles compared with the least regular quintile.
VV Study Evidence Matrix v1.0
VV Evidence Utility Score
A bounded score for how useful this study is in public explanation, based on evidence tier, design, applicability, endpoint relevance, limitations, safety signals, and publication/source strength.
74/100
Useful Public Evidence
- Evidence tier
- 66/100, weight 18%
- Design strength
- 66/100, weight 18%
- Applicability
- 75/100, weight 16%
- Endpoint relevance
- 88/100, weight 16%
- Limitations transparency
- 80/100, weight 12%
- Safety signal usefulness
- 57/100, weight 10%
- Publication/source strength
- 88/100, weight 10%
Useful for context, but limited by safety signal usefulness, evidence tier, design strength.
How the study framework works ->Key Findings
- Higher sleep regularity was associated with a 20% to 48% lower risk of all-cause mortality across the top four SRI quintiles compared with the least regular quintile.
- Higher sleep regularity was associated with lower cancer and cardiometabolic mortality across those quintiles.
- Sleep regularity was a stronger predictor of all-cause mortality than sleep duration in equivalent and nested models.
- Associations persisted after adjustment for demographic, behavioral, shift-work, socioeconomic, and health variables.
Limitations
- Observational design cannot establish causality.
- One week of accelerometer data may not represent long-term sleep regularity.
- Sleep regularity may be both a cause and marker of risk.
- UK Biobank selection limits generalizability.
Why It Matters
All-cause and cause-specific mortality by Sleep Regularity Index.
Viral Vitalism Verdict
Useful evidence, bounded by design: Observational design cannot establish causality.
Sources
Signal cards
Used in signals
Signal coverage connected to this study through explicit study links, canonical source refs, or evidence visualizations.
Sleep Is More Than Hours—and Less Certain Than the Headlines
Poor sleep tracks with inflammation, chronic disease, and mortality risk. The signal is meaningful, but the strongest outcome evidence is observational—not proof that a better sleep score adds years to life.
VV Signal Score
65
Promising signal
- Sources
- 6
- Studies
- 6
- Claims
- 6
Claim ledger
Relevant claims
Claim ledger records connected through this study's ID, topic tags, or source IDs.
sleep: Objective sleep regularity is associated with all-cause and cause-specific
Objective sleep regularity is associated with all-cause and cause-specific mortality risk, and may capture a health-relevant sleep dimension that average duration alone misses.
sleep: Sleep duration, sleep quality, and sleep regularity are distinct
Sleep duration, sleep quality, and sleep regularity are distinct dimensions of sleep health, and consumer claims should avoid treating hours slept as the whole sleep signal.
sleep: Improving sleep duration, quality, or regularity is a plausible
Improving sleep duration, quality, or regularity is a plausible health intervention, but direct evidence that consumer sleep improvement lowers all-cause mortality remains under-proven.
sleep: Sleep duration is associated with all-cause mortality in a
Sleep duration is associated with all-cause mortality in a U-shaped pattern in prospective cohort meta-analysis, with both short and long sleep linked to higher mortality risk versus roughly 7 hours, but causality is not proven.
sleep: Longitudinal commercial wearable sleep data can reveal associations between
Longitudinal commercial wearable sleep data can reveal associations between sleep duration, irregularity, sleep stages, and chronic disease incidence, but wearable sleep scores should not be treated as clinical-grade diagnosis.
sleep: Sleep disturbance has biologically plausible links to inflammatory and
Sleep disturbance has biologically plausible links to inflammatory and immune dysregulation through cytokine, neuroendocrine, autonomic, and antiviral-response pathways, but inflammation mediation between sleep and mortality is not settled.