Thanks for the concern, folks!
I am a natural night person who has been forced to spend the last 41 years living on a normal schedule. As a professional computer programmer, I have a certain leeway to set my schedule. but I can't quite make a "sleep at 6 am, wake up past noon" work for most employers. I also have sleep apnea (diagnosed -- but why do they insist on only measuring you from 10 PM until early morning?) but have not yet gotten a CPAP machine. So, I have seen doctors, it's just a long process that is still ongoing. And here's the next night's sleep:
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