The opposite of "more sleepyheaded" is "more awake." When someone is described as being "sleepyheaded," it means that they are drowsy, groggy, or in a state of lethargy. On the other hand, being "awake" implies that one is alert, lively, and active. Other antonyms for "sleepyheaded" include "alert," "energetic," "wide-awake," and "vigorous." It's important to note that these antonyms have positive connotations associated with them, as they convey a sense of productivity, awareness, and enthusiasm. While being sleepyheaded may be unavoidable at times, striving to be more awake and active can positively impact one's daily life.