Nothing good happens after midnight
Was thinking of that very phrase late last night.
Or after dark depending where you are.
Speaking of Harlem, I'm in the 125th Street area (near the Metro North tracks) quite often during the day. Never have any issues. One night, I decided to walk to that station after a Yankees game instead of standing in line to get onto the crowded subway cars. I survived but I'm NEVER doing that again. Totally different neighborhood after working hours.