From Longman Dictionary of Contemporary Englishwake up phrasal verb1 to stop sleeping, or to make someone stop sleeping James usually wakes up early.wake somebody ↔ up I’ll wake you up when it’s time to leave.2 LISTENto start to listen or pay attention to something Wake up (=give me your attention) at the back there!3 wake up and smell the coffee American English spokenREALIZE used to tell someone to recognize the truth or reality of a situation → wake→ See Verb table
Examples from the CorpusWake up• Brown stains caused by small flames crept inwards. Wake up.• Wake up, he thought. Wake up, my love.• A perfect sculpture of the living flesh. Wake up, he thought.• I still miss it. Wake up nights hungry and see it.• Try to get inside the next one's shields. Wake up, Tundrish.wake up and smell the coffee• While the field has changed with rent control nearly quashed, wake up and smell the coffee of a new day.