Hmmmm.... just adding things in to compliment the input.
My location: very rural subdivision a few hundred yards from the fringe of a state park/lake. Listening room: finished, basement behind subterranean reinforced concrete walls. I can’t recall what the “technology” is called, but all my equipment is behind a UPS that completely isolates AC output from AC input by reconstituting the AC voltage and sine wave from a bank of DC batteries.
But, I still notice it. Yes, lights out except for the annoying glow of power on indicators helps (I buy off on the your mind gets distracted by other input (light)). Despite my AC isolation, also buy off on the AC/Power grid. Environmental noise is very low in the listening area, all but the most severe thunderstorms go unnoticed, and can be soo quiet that you can hear your heart beat, but I also buy off on ambient noise being less. Having AC isolation I leave my electronics on, so they are always “warm”, but also buy off on after listen for a while at night it still warms up after a while of listen (all the right components within the components warmed up?). I also buy off on the magic of a deep blanket of snow.
i can’t recall ever having a similar DAYTIME experience.... does that support that the SUN does many more things to this earth than provide light and warmth?
i still believe in (enter some ominous music here) “IT ONLY COMES OUT AT NIGHT! (Evil LAUGH (Vincent Price))