For starters, cold still air carries sound better than warm air. Heat rising from surfaces due to the sun’s heat means there’s always a varying amount of updraft during the day. Once things cool down at night there’s less turbulence.
Sound also creates its own turbulence. Consider “sound particles” as someone trying to get through a mosh pit to the bathrooms.
The more sounds and craziness going on, the harder it is to reach you.
When there’s less sounds, less movement, and more space, it’s easier for sound to get to you in a way your brain can process.
Because there are no ambient noises. Traffic, people walking around, horns, a lot animals are active during the day as well.
Basically things are quieter at night and hence quieter things become more noticable because of it. And louder things seem louder because there are not many other sounds to drown out these sounds.
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