The New York State Thruway service-area map lists which concessions inhabit each service area. Well, I'm calling them "concessions"... but apparently, in turnpike corporatese, a Starbucks or a McDonalds in a service area is called a "concept." Thus, the map's legend informs us that "24-hour concepts" appear in bold lettering.

So if you ever wake up in the middle of the night and you can't find the insightful paradigm, penetrating theory, or brilliant idea you came up with earlier in the day... maybe what you have there is a concept that's limited to bankers' hours or standard retail hours. (And if the concept comes and goes at peculiar times of day... well, maybe it's operating on a British pub-licensing schedule!)