The antonyms for the phrase "are sleepy" are "are awake," "are alert," "are energized," and "are lively." When someone is feeling sleepy, they are in a state of drowsiness or fatigue. The opposite of this is being awake, which means one is conscious, alert, and fully aware of their surroundings. To be alert is to have a sharp and attentive mind, to remain vigilant, and to stay focused. If someone is feeling energized, they are full of vitality and ready to take on any task. Being lively means feeling exuberant, enthusiastic, and lively, often associated with enthusiastic or jovial personalities.