wake up

verb3

1. •
   To stop sleeping; to awake.

   • "Woke up, fell out of bed, dragged a comb across my head" — 1967
2. •
   To awaken somebody.

   • Wake your brother up; it's time for school.
3. •
   To become more aware of a real-life situation; to concentrate on the matter in hand.

   • Some businesses were slow to wake up to the importance of the Internet.
   • That's the third time you've made the same mistake. Wake up!