David of Broadway wrote:

Catching up? With three exceptions, every single subway station in New
York is open around the clock. (The three exceptions are the two
northernmost stations on the 3, which are replaced by bus service at
night, and Broad Street on the J/M/Z, which is closed on weekends, when
the J is cut back to Chambers Street.)

Actually, there's a fourth exception: the Aqueduct Racetrack station is
only open when the racetrack itself is open. And southbound trains
never stop there, since the platform is on the northbound side, adjacent
to the racetrack. Good thing the Aqueduct-N. Conduit Boulevard station
is so close by.
--
David of Broadway
New York, NY, USA