You’re a kid on Christmas morning, among your presents is that toy you’re been hinting about for months. Yes! What…batteries not included and all the stores are closed?! Ahhh…memories.
Growing up in the 60’s, by 9pm almost every store and restaurant was closed. In my neighborhood the only places open were a bakery, a small convenience store and a tiny drive-inn. Other than the bakery, everything closed by 1 or 2 am at the latest. I think the breakfast counter of the bakery may have been open 24/7, but the bakery closed about midnight, sooner if everything was sold.
I think there may have been a few 24/7 eating places by the University.