text: Nat: How are you doing?
  Tom: Worse than I'd have thought.
  Nat: Me too. My head is getting heavy.
  Tom: I guess I'll call it a day. Whatever will be, will be...
  Nat: You think so?
  Tom: What's the point of sitting and struggling with your falling eyelids?
  Nat: OK. I'm going to sleep too.
  Tom: Yeah. See you before the exam.
  Nat: Good night!
  Tom: Good night!
target: Nat and Tom are too tired to continue studying for tomorrow's exam.