Does sound travel better at night?

Mine also sounds better in the evening. I believe that the electricity supply is cleaner also, however I also believe that the seismic activity is less due too less travels on the road and the general noise floor in the local area (other people asleep). Maybe our bodies have a lower noise floor when we are relaxed more??

Even though consciously, you don't really notice it, at night the ambient background noise everywhere is lower. Therefore you will hear more at night, I think. If you've ever been outside at night when there is a widespread power outage, the silence is deafening. Often we do not realize just how much background noise is around us during the day, but at night, it is much lower. Just my 2 cents.

Happy night listening.

In most cases the improvement comes from the combination of,
"less noisy" & more abundant power supply,
reduced ambient noise,
and our own relaxation.

You are very likely more deaf at night (people consistently do better in hearing tests given prior to confronting noisy traffic, noisy work environments, etc.).
FWIW.

The wine helps.