My guess? A (short) power interruption. But that doesn’t match with the log saying a service did it. The below suggestion is not a bad one. Could it be a routine in Google Home or something?
It’s literally every night… But not all my lights… I have 4 exterior lights and one interior light setup in an automation to turn on/off at sunset/sunrise… (1) interior and (1) exterior are being turned off at 12:ish every night…
“Switch - Exterior Garage Lights turned off triggered by service Light: Turn off
12:20:16 AM - Yesterday - Home Assistant Cloud”
“Light - Above Sink Light turned off triggered by service Light: Turn off
12:20:16 AM - Yesterday - Home Assistant Cloud”
Are these lights also controllable via some other vendor specific app? How sure are you that it’s not a long forgotten automation or script. Do you have the vscode addon installed & have you searched for the entity id’s by name through all your config?
The first thing I would look at is whether by chance your light is controlled by another supplier. Then I would look at whether you have a properly updated script, possibly decide to disable Cloud, and see if this problem persists.