We found one dictionary that defines the word while the city sleeps:

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1. While the City Sleeps: Wikipedia, the Free Encyclopedia

▸ Words similar to while the city sleeps ▸ Usage examples for while the city sleeps ▸ Idioms related to while the city sleeps ▸ Wikipedia articles (New!) ▸ Words that often appear near while the city sleeps ▸ Rhymes of while the city sleeps ▸ Invented words related to while the city sleeps