answer: Mister Williams tells Miss Jones that David looks tired because he goes to bed late. Miss Jones suggests he get David in bed earlier.
documents: #Person1#: Mister Williams, these days, David has been looking tired all the time. He has been falling asleep in class. I wonder if you should take him to see a doctor.
  #Person2#: Thanks, Miss Jones. I know what the problem is. He's recently been going to bed far too late.
  #Person1#: When does he go to bed?
  #Person2#: Usually around 11 o'clock. Sometimes even later.
  #Person1#: That's much too late. Can you help him get in bed earlier? Say around 9:30 or no later than 10 o'clock.
  #Person2#: We'll try. You know both David's mother and I often have to stay up late because of our work and recently David seems to have also got into our bad habit of going to bed late.
  #Person1#: Yes, but David has to get up very early for school. I'm really worried about his health and his studies.
  #Person2#: Yes, you're right. We'll try to change our habits to set a good example for David.