"Catching some zzzs" is an idiomatic expression used to describe sleeping or taking a nap. Antonyms for this phrase can include remaining awake, staying up, or working through the night. Other antonyms may include activities or tasks that require focus and alertness, such as studying, exercising, or socializing. In a broader sense, antonyms for "catching some zzzs" may include activities that stimulate the mind and body, such as traveling, exploring, or trying new experiences. Ultimately, the antonyms for "catching some zzzs" depend on the context and the purpose of the activity or task at hand.