A: Good morning! It's time to wake up.
   - 좋은 아침. 일어날 시간이야.
    Did you sleep well?
   - 잘 잤니?

B: No, I couldn't sleep last night.
   - 어젯밤 잘 못 잤어요.
     I stayed up so late last night.
   - 어젯밤 늦게 까지 안 잤어요.