"Catches forty winks" is an idiomatic phrase that means taking a short nap or resting for a little while. Antonyms for this phrase might include staying up, being alert or awake, working persistently, or actively engaging in something. Some other words that might serve as antonyms for "catches forty winks" could be: vigorously working, fast-paced activities, exercising, focusing intently, or staying attentive. Whether someone is pulling an all-nighter, participating in a high-energy activity, or simply pushing through a busy day without rest, there are plenty of antonyms for "catches forty winks" that describe the opposite of taking a quick nap or moment of rest.