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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
Smart rings can also be excellent fitness trackers.
A smart ring might be a better alternative to wearing a smartwatch to sleep.
Smart sleep-tracking rings are both stylish and functional. However, the best don’t come cheap.
You can get them on Amazon!
Wouldn’t take much to adapt the lie detectors you can get on amazon, but yeah. just for fun, not life decisions.
Unreliable to say the least, ask Jeremy Kyle.
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.