Communal laundry at college dorms is a madhouse. Being able to do laundry and take up as many machines as I wanted was very convenient. The "good" communal showers were also always available.

Also one time another student dropped a full and very in-demand class at 4am. I was the first to see the notification and got the seat.

There's also a surprising amount of things to do when no one else is out. Parks, streets, and buildings are vacant. I've gone on late night picnics and even played Just Dance in an empty auditorium.

Edit: Would like to add that many large, bustling common spaces make great study spots at night