Illustration by Ian Berry/CNN

Nikki Gooding didn’t know what was happening, but something was up.

In early December, the 27-year-old aesthetic nurse practitioner had started feeling off. She was exhausted, even though she was getting plenty of sleep. Despite her love of food, her appetite was nearly gone. And she’d wake up in the middle of the night drenched in sweat. No matter what she did, she felt like she was caught in a never-ending hangover.

At the same time, her Oura Ring , a health tracking smart ring that claims to give wearers a “holistic picture” of their health, was also giving her strange reports. Her basal body temperature was consistently higher than normal, far from the natural ups and downs she’d become accustomed to. And she kept getting alerts that her ring was se

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