Your watch says you had three hours of deep sleep. Should you believe it? Millions of people rely on phone apps and wearable devices like rings, smartwatches and sensors to monitor how well they're ...
Be Well-Sleep Tracking Devices Middle school teacher Kate Stoye checks her sleep score on her phone, Wednesday, Jan. 7, 2026, in Hiram, Ga. (AP Photo/Emilie Megnien ...
Middle school teacher Kate Stoye checks her sleep score on her phone Jan. 7 in Hiram, Ga. Middle school teacher Kate Stoye puts on an Oura ring, a wearable sleep tracking device, Jan. 7 in Hiram, Ga.
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