Plain-English Summary
SRI Cardiometabolic Risk studied Sleep Regularity Index in Older adults in the Multi-Ethnic Study of Atherosclerosis. Sleep irregularity was associated with delayed sleep timing, increased daytime sleep and sleepiness, reduced light exposure, and was independent of sleep duration.
Key Findings
- Sleep irregularity was associated with delayed sleep timing, increased daytime sleep and sleepiness, reduced light exposure, and was independent of sleep duration.
- Greater irregularity correlated with 10-year cardiovascular risk, obesity, hypertension, fasting glucose, hemoglobin A1C, and diabetes status.
- Irregularity was also associated with perceived stress and depression.
Limitations
- Analyses were largely cross-sectional.
- Causation and directionality cannot be established.
- Some subgroup analyses were underpowered.
Why It Matters
Sleep Regularity Index validation and associations with cardiometabolic risk markers.
Viral Vitalism Verdict
Useful evidence, bounded by design: Analyses were largely cross-sectional.