Am up is a common phrase that is used to indicate that someone is awake and ready to start the day. However, there are several other ways to express the same idea. Some synonyms for am up include:
• Rise and shine
• Awake and alert
• Up and at 'em
• Wide awake
• Up and around
• Out of bed
• Functioning
• Alert and ready. Using synonyms like these can help add variety and interest to your writing, and make your communication more engaging and effective.