Heads up to anyone running macOS Catalina. When putting your Mac into sleep mode the screen may turn "Blue" after awhile in Sleep Mode. I got my first Blue Screen a few days ago and one yesterday morning. Apple is aware of the problem and I also sent feed back to Apple on this problem. More information here: https://forums.macrumors.com/threads/blue-screen-in-sleep-mode.2213694/?post=28024564#post-28024564
Hello @ProTruckDriver I can only imagine that wretched feeling you must experience upon seeing your iMac's blue screen. Yet, I can't help but wonder if the issue would resolve if you could update to macOS Big Sur 11.2.3 (20D91). Is that in the realm of possibility? HTH