system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the wind usually seem so much more calm at night time?
gpt
Wind is caused by horizontal differences in air pressure.  One way for pressure to fluctuate is when air heats up and rises.  During the day, the sun will heat up certain surfaces faster than others.  When the surface heats up, the air above it rises, causing a low pressure area.  Air from a higher pressure area then travels towards the low, which creates wind.  At night, there is no surface heating, and therefore you don't get this type of wind.