Oura Ring: the most accurate sleep and activity tracker is all about you: it measures the physiological signals of your body, understands your lifestyle, and guides you to make your own optimal daily choices. The ring features scientifically validated sleep tracking and personalized guidance.
The Oura ring claims to measure different sleep stages to encourage healthy lifestyle changes. It's more discreet than a wrist-based wearable but still is a little chunky
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you can get necklaces that do it too
Weird – this measures your sleeping patterns too. Want one!
Done oura measures your heart rate https://www.wired.co.uk/article/oura-ring-uk-sleep-tracking#:~:text=The%20ring%2C%20which%20is%20designed,track%20day%2Dtime%20activity%20too.