Print If you’ve had COVID-19 and are wondering why, months later, you don’t feel like your old self, the answer might be wrapped around your wrist, according to a study by La Jolla-based Scripps Research. Scripps scientists sifted through wearable-device data in an effort to understand how COVID-19 infections affect heart rate, sleep and activity levels. They found it typically takes two to three months for those measures to return to pre-COVID levels. But in some people, those changes drag on much longer, and researchers are only beginning to understand why. The study findings, published July 7 in the scientific journal