Good morning all. Happy Sunday 
I’m using a 2012 Mac mini running Catalina 10.15.6.
The machine is almost never actually turned off overnight…just sleeps. When I woke it this morning, dark mode was running.
Note that I have not turned dark mode on ever and it’s definitely not set to automatic.
Yes, I know it’s a first world problem but I was wondering if anybody can shed any light on why/how this happened overnight