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All human beings need sleep. We spend a third of our lives asleep, and it’s as important as food, water or air to our survival. While scientists are still working to understand the exact nature of sleep and why it’s so important to our well-being, decades of research have made it clear that adequate sleep…

For years, smartwatch makers have promised to make our wrists the next frontier in health monitoring. Heart rate, ECGs, blood oxygen, sleep tracking, and body temperature have all found their way into modern wearables. Blood sugar is widely expected to be next