This Apple Watch app can track your sleep stages

Technology Nov 07, 2025

A new study from UMass Amherst found that the BIDSleep app on Apple Watch Series 6 can track your sleep stages—like light, deep, and REM—with about 71% accuracy.
That's closer to the results of lab tests using EEGs than other AI sleep tools, and outperforms other well-known approaches used by the sleep research community.

BIDSleep is a game-changer for sleep tracking

BIDSleep lets you monitor all your sleep (including naps) right from your wrist, skipping the hassle of electrodes or overnight lab visits.
For anyone curious about their sleep health—or dealing with possible sleep issues—this could make tracking way easier and more comfortable.
It's a step toward making advanced sleep insights accessible to everyone, not just those who can do expensive studies.