Antonyms for the phrase "catch forty winks" would be related to staying awake and alert. Words like energize, invigorate, stimulate, refresh, revitalize, and boost describe actions that could be taken to remain awake and engaged. Some antonyms could include working, exercising, socializing, conversing, reading, or engaging in mentally stimulating activities. Additionally, certain foods, beverages, or supplements, such as caffeine or B vitamins, could also provide a boost of energy to combat drowsiness. Catching forty winks can be refreshing in some cases, but it's important to stay alert and focused during the day to accomplish tasks and maintain productivity.