"Wake up" is a common phrase used to describe the action of rousing from sleep, but there are many synonyms that can be used to add variety to your writing or speech. Some common synonyms for "wake up" include "arouse," "awaken," "stir," "rouse," "revive," "shake," and "rouse from sleep." Other options include "rise," "get up," "spring up," "stir up," "rouse up," and "be stirred from sleep." Each of these phrases can add a slightly different connotation to your meaning, so it's always useful to have several options at your disposal.