I hope you'll be able to find out as much as possible about your sleep apnea, to know if its a factor in your insomnia and if so, be able to treat it. Sometimes conditions develop at the same time as other events (like pandemics) so that it's tempting to see a causal relationship (Covid caused insomnia). During Covid, arthritis in my knee and lower back became limiting issues for me, whereas I had no symptoms before Covid. The arthritis had been there for a while, obviously, but it started to cause problems at a certain point in time, which happened to come in the winter of 2020. Good luck--