I lived 23 years in Manhattan and adapted to the 24 hrs. of busses, airplanes, helicopters, garbage pickup, and emergency vehicle sirens. New York City definitely never sleeps.
But former Manhattan residents (like me) sometimes forget when we come back to visit!
A large clear glass candy jar full of squeezable ear plugs is a great solution. They are super cheap on Amazon and you can't miss a candy jar full of these wrapped brightly colored items by the bed. They look like candy!
Not everyone will need them, but but for those of us who "forgot" how noisy Manhattan is, it can definitely help get a good nights sleep.