Given the task definition and input, reply with output. In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: The clock chimed every half hour and louder on the hour. Sentence2: It never seemed to wake anyone up at night. Sentence3: Everyone got accustomed to the chimes and slept on. Sentence4: One night, the clock stopped.
Everyone woke up and could not get back to sleep.