The Biggest Wish / Stopped Clock

S1, E25: Oswald catches a firefly, and gets to make a wish on it. But he can't decide what the perfect wish should be. He asks all his friends for advice, but none of their wishes are what he would wish for. Then, that night, he suddenly realizes what his big wish should be. The clock on the Alarm Clock Building is stopped, and Oswald oversleeps.  He discovers that everyone in Big City is still asleep. Oswald has to go inside the clock and fix it, so that it can ring everyone awake.