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.
Happy night listening.