BMJ Open Diabetes Res Care

How much sleep protects against insulin resistance—and when does more become too much?

March 12, 2026

A large cross‑sectional analysis of 23,475 U.S. adults from NHANES (2009–2023) found an inverted U‑shaped relationship between weekday sleep duration and estimated glucose disposal rate (eGDR), a validated surrogate for insulin resistance. The optimal sleep duration was approximately 7.3 hours per night, with sleep below this threshold associated with lower eGDR that improved with additional rest, while sleep beyond it was associated with worsening eGDR. Weekend catch‑up sleep (WCS) had mixed effects: 1–2 hours of WCS improved eGDR for individuals with weekday sleep debt, but >2 hours of WCS was associated with poorer metabolic profiles in those already meeting or exceeding optimal weekday sleep.

Clinical takeaway: Encourage patients to aim for consistent ~7-hour sleep schedules, using modest (1–2 hours) weekend catch‑up sleep only when weekday sleep is insufficient, and avoiding large weekend sleep swings that may impair metabolic health.

Source:

Fan Z, et al. (2026, March 3). BMJ Open Diabetes Res Care. Association of weekday sleep duration and estimated glucose disposal rate: the role of weekend catch-up sleep. https://pubmed.ncbi.nlm.nih.gov/41775621/