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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.
Wouldn’t take much to adapt the lie detectors you can get on amazon, but yeah. just for fun, not life decisions.
you can get necklaces that do it too
Weird – this measures your sleeping patterns too. Want one!