I’m not sure of the technical details and how it works but the electric grid is inductive during the day and capacitive at night. More technical minds might be able to shed some light on how that affects audio electronics.
DISCUSSION: "It only comes out at night". Does anyone else have this experience!?
In my listening experience, whatever system you have, whatever components, whatever the material, medium, one thing always seems to remain constant. It ALWAYS sounds better in the deep and still of the night!!!
Is it because night time is generally quieter? Is it because the world of electronics is then shielded from the SUN? Is it because there is less demand on the electrical service?
Whatever it is, there is one thing I know for sure, music sounds better late into the night!