The best sleep trackers of 2025: Expert tested and reviewed

The Oura Ring 4 is a competitive sleep tracker, with insights into sleep efficiency, restfulness, readiness, latency, and more. I've been using the Oura Ring for a while now, and it has not only given me deeper insight into my sleep but also supplements those data points with explanations behind the numbers. Oura claims to accurately track sleep cycles, total sleep time, resting heart rate, heart rate variability, and movement. These features have been enhanced with the rollout of the fourth-generation Oura Ring, which hit the market in October. The Oura Ring 4 has smart sensors that allow more accurate and continuous data capture. It's also more comfortable than the Oura Ring 3 and has flattened sensors that make it easier to wear over time. Also: I tested the Oura Ring 4 for weeks. Here's why it's the best health tracker right now Every morning, I get a sleep score for last night's sleep and view my heart rate, sleep efficiency, and suggested bedtime range for the day. The sleep s ... Read full article.