The phrase "cops some z's" is a colloquial expression that means "to get some sleep." When looking for antonyms for this phrase, we need to find words that have the opposite meaning. Some antonyms for "cops some z's" could be "stays awake," "remains alert," or "keeps vigilant." Other possibilities might include "works overtime," "burns the midnight oil," or "pulls an all-nighter." These antonyms suggest that the opposite of getting some sleep is staying up late or working hard. Whatever the antonym, it is clear that "cops some z's" is a phrase that implies rest, relaxation, and a break from the hustle and bustle of everyday life.