The phrase "caught forty winks" is commonly used to describe a quick nap or a short period of sleep. However, the antonyms for this phrase could include staying awake, being alert, being vigilant, or remaining active. These antonyms emphasize the opposite of sleeping or taking a rest, indicating that one is attentive, focused, and devoid of any form of drowsiness. The phrase "caught forty winks" may be associated with relaxation and rest, but the antonyms highlight the importance of being present and invested in one's activities, whether it be work or leisure.