Went to the BK late at night too many times (all the way from North campus) during my time.
Hey, it was cheap and usually spent too much $$ drinking my way across bars in Chicago; the Sandwich guy (RIP) was a lot more convenient, but too pricey due to the constant need to fill my belly (looking back, wish had tried his sandwiches a few times).
It was no Buffalo Joe's (but that was too far away if one didn't drive).
Interesting enough, think I went to the McDonald's in Evanston just once, despite knowing the guy whose family owned that franchise and a bunch of others.