Exact same problem here. Apple Care told me to reboot into Safe Mode, then reboot again into normal mode because "Safe Mode fixes things." I asked if there was a log to see if anything was fixed, he said no. I don't have much confidence that rebooting twice did anything other than fulfill the support checklist. His next step is to reinstall Catalina.
Anyway, I just unticked every single setting in the power control panel and we'll see if that fixes things. I have external drives, including Time Machine. I bet it was trying to run TM while sleeping.