The sentence that does not use language figuratively is the following:
I felt like I could take a nap after the long day of tests that I had.
The rest of the sentences use figurative language, which is a language that uses figures of speech (allusions, metaphors, similes, hyperbole, etc) to be more effective.
The basic function of the figurative language is to help the reader to imagine what the writer wants to express. Writers generally use this technique to bring out emotions.
