Sleep disturbances compared to traditional risk factors for diabetes development: Systematic review and meta-analysis.
Level 1 - systematic review of randomized trials
Systematic review and meta-analysis of prospective cohort studies
PubMed 26687279 · doi:10.1016/j.smrv.2015.10.002
What was done
A systematic review and random-effects meta-analysis of cohort studies from Medline and Scopus evaluating associations between sleep disturbances and incident diabetes. Exposures included short duration (≤5 h, 6 h/d), long duration (≥9 h/d), poor sleep quality, obstructive sleep apnea (OSA), and shift work across 36 studies with 1,061,555 participants. Pooled relative risks were compared to effect sizes from existing systematic reviews of traditional risk factors (overweight, family history, and physical inactivity).
What was found
Sleep disturbances significantly increased incident diabetes risk: - Sleeping ≤5 h/d: RR 1.48 (95% CI: 1.25, 1.76) - Sleeping 6 h/d: RR 1.18 (95% CI: 1.10, 1.26) - Sleeping ≥9 h/d: RR 1.36 (95% CI: 1.12, 1.65) - Poor sleep quality: RR 1.40 (95% CI: 1.21, 1.63) - Obstructive sleep apnea: RR 2.02 (95% CI: 1.57, 2.61) - Shift work: RR 1.40 (95% CI: 1.18, 1.66) Traditional risk factors showed pooled RRs of 2.99 (95% CI: 2.42, 3.72) for overweight, 2.33 (95% CI: 1.79, 2.79) for family history, and 1.20 (95% CI: 1.11, 1.32) for physical inactivity.
Why it matters
The elevated diabetes risk associated with sleep disturbances is comparable in magnitude to physical inactivity. These findings suggest sleep evaluations should be incorporated into routine type 2 diabetes screening and prevention guidelines.
Limits
The underlying studies were observational cohorts, limiting causal inference and leaving potential for residual confounding from diet, socioeconomic status, or underlying comorbidities. The abstract does not specify whether sleep variables were objectively measured or self-reported. Traditional risk factor comparisons relied on separate external systematic reviews rather than direct head-to-head adjustments within the same cohorts.
Cited by
- supports Shift workers who experience chronic sleep-wake disturbances are at a substantially higher risk of developing obesity and type 2 diabetes.