Key facts
- Fitness trackers were tested at Stanford's sleep lab.
- The Oura Ring 5, Fitbit Air, Whoop MG, and Apple Watch were evaluated.
- The focus was on the accuracy of sleep quality measurement.
An investigation into the accuracy of the latest fitness trackers in measuring sleep quality was conducted at Stanford's sleep lab. Nicole Nguyen evaluated four devices: the Oura Ring 5, Fitbit Air, Whoop MG, and Apple Watch. The core of the testing centered on how precisely these wearables can assess a good night's sleep.