The reliability of sleep tracking devices, such as smartwatches and rings, is questioned as they infer sleep states from heart rate and movement rather than measuring sleep directly. Experts emphasize that while these devices can highlight trends over time, they should not be relied upon for definitive sleep health measures. Some users find them helpful for improving sleep habits, while others experience anxiety from obsessively tracking sleep scores. The future of wearables may include detecting health issues before symptoms appear. Teljes cikk (Euronews.com)