"Up at em" is an idiomatic expression used to describe being alert and active in the early morning hours. Some synonyms for this phrase include "bright-eyed and bushy-tailed," "wide awake," "alert and ready," and "firing on all cylinders." These all convey the same sense of being energized and motivated, indicating a readiness to tackle the day ahead. Other related phrases include "early bird catches the worm" and "rise and shine," which emphasize the importance of starting the day off right and making the most of one's time. Whatever the chosen phrase, the key is to maintain a positive attitude and stay focused on achieving one's goals.