The word "over-tired" implies a state of extreme fatigue, with physical and mental exhaustion. The antonyms of this word could be "refreshed," "rested," "energized," "revitalized," and "rejuvenated." These words indicate that the person has received adequate rest and is feeling invigorated and alert. Other antonyms could be "wide-awake," "alert," "animated," "vigorous," and "lively." These words indicate that the person is active and spirited, ready to take on the day's challenges. Having a good night's sleep, a healthy diet, and regular exercise can help maintain energy levels and avoid the feeling of being over-tired.