Overview
- New tiers are: Very Low 0–40, Low 41–60, OK 61–80, High 81–95, Very High 96–100.
- The former “Excellent” label is now “Very High” to emphasize a more objective description of results.
- Sleep Score still derives from Duration (50 points), Bedtime consistency (30), and Interruptions (20).
- Apple cites insights from the Apple Heart and Movement Study alongside guidance from major sleep organizations as the basis for the update.
- Coverage notes that short, restless nights can still rate as “High,” and Sleep Score is available on Apple Watch models running watchOS 26 even as reports conflict on whether a Watch is strictly required.