When Apple introduced Sleep Score at its iPhone 17 and watchOS 26 launch event, it framed the feature as a major leap in Apple Watch sleep tracking. Tim Cook’s keynote slide boasted that the Apple Watch would now «quantify your night» through a simple, scientific-looking number out of 100.
For many users, including myself, it sounded like Apple was finally getting serious about sleep science. But after a full month of testing Sleep Score every night, I’ve reached a different conclusion: the Apple Watch Sleep Score is more cosmetic than scientific. It looks useful, but it fails to measure what...