Antonyms for the phrase "hadst forty winks" could include alertness, wakefulness, vigilance, and attentiveness. These antonyms denote a state of being fully awake and engaged in one's surroundings, as opposed to dozing off or napping. Other antonyms might include productivity, work ethic, activity, and busyness, as these terms suggest a lack of leisure time or opportunity to rest. Additionally, antonyms for "hadst forty winks" could include insomnia, restlessness, or the inability to fall asleep, as these states run counter to the idea of achieving rest and relaxation.