The phrase "am up up" has various synonyms that can be used interchangeably, depending on the context and the tone of the sentence. Some examples of synonyms for "am up up" include "awake and alert", "wide-awake", "fully conscious", "energized and ready", "up and about", "bright-eyed and bushy-tailed", "ready to tackle the day", "full of beans", "perky", and "refreshed". These synonyms convey a sense of being awake and alert, suggesting that the person is ready to face whatever challenges come their way. Using these synonyms can add variety and nuance to your writing and speech, making them more engaging and expressive.