1. Optimal weekday sleep duration was ~7.3 hours for the most favorable insulin sensitivity (estimated glucose disposal rate).
2. Short weekday sleep (<7.3 hours) was associated with greater insulin resistance.
3. Long sleep (≥7.3 hours) was also linked to worse metabolic profiles.
4. Moderate weekend catch-up sleep (1–2 hours) improved estimated glucose disposal rate in those with sleep debt.
5. Excessive catch-up sleep (>2 hours) was associated with poorer metabolic outcomes.

Source: BMJ Open Diabetes Research & Care