How to: apologize and explain

J- Clàudia! What's going on?
C- What's the matter? What have I done?
J- Look at the time. Have you been up all night?
C- Sorry Júlia. I didn't mean to. I didn't realize that it was morning.
J- Clàudia, you know I don't like it when you spend so much time on facebook.
C- Well, it hasn't happened before.
J- Clàudia! It's the fourth time that you've spend all night online!
C- OK. Listen, I'm really sorry. Don't worry. It won't happen again, I promise.
J- I hope you're right. We'll see.