'Dr. Marc Sala, co-director of the Northwestern Medicine Comprehensive Covid-19 Center, said fatigue has become the dominant complaint from his patients. That could be because Covid symptoms are becoming milder overall — he no longer regularly sees patients with severe respiratory damage, and so fatigue has come to the forefront, he said. It’s also possible that fatigue could be a more common symptom with the newer variants, he said.'

https://www.nytimes.com/2023/09/27/well/live/covid-symptoms-fatigue.html