The watchOS 26.2 update arrives with a tighter sleep-scoring system and a required Wi-Fi change for users in the European Union.

Apple Watch Series 10

Apple Watch Series 10
Apple adjusted the sleep score ranges in watchOS 26.2 to better match how people feel after a night’s rest. The highest score now reflects a genuinely restorative night instead of a generous rating.
Users who track sleep daily may see different numbers even when habits stay the same.