Carolyn, Since you mentioned the sleep problems began Sept/Oct 2021 post COVID, I was wondering if you might consider posting your question again in the following discussion to see if other members have had similar problems sleeping?

Any tips to help recovery for a COVID Long-Hauler?: https://connect.mayoclinic.org/discussion/long-hauler/

I also found an article on the topic that might shed some light on the problem.
-- Sleep Dysfunction in COVID-19 Patients: Prevalence, Risk Factors, Mechanisms, and Management: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8618512/