The phrase "copping some zs" is a casual expression that means to sleep or get some rest. Its antonyms are words or phrases that convey the opposite meaning. The most common antonyms for "copping some zs" are to stay awake, to pull an all-nighter, to burn the midnight oil, to work late, to fret, to worry, to agonize, and to stress out. These antonyms suggest a state of hyper-vigilance or a need to stay alert and focused, rather than to relax and recharge. While there are situations where staying awake is imperative, it's important to take breaks and recharge to maintain optimal mental and physical health.