answer: Helen's tired because she dreamed a bad dream so she didn't get enough sleep, then Helen describes the details of the dream to #Person1#.
documents: #Person1#: Hello Helen, you look bad. Is everything OK?
  #Person2#: Yes, I'm fine, thanks. I'm just a bit tired this morning. That's all.
  #Person1#: Why is that? Did you stay up last night?
  #Person2#: Not at all, but I had this dream and it woke me up so I didn't get much sleep. I dreamt of walking through a forest at night. I couldn't see anything.
  #Person1#: That sounds frightening.
  #Person2#: In my dream, I saw white light behind some trees. It was a strange light because it seemed to get bigger and then smaller as if it was alive. At first I just stood where I was. But then the light seemed to move toward me and I could see something in it like the face of an old man. I tried to run away, but my feet felt very heavy, and I couldn't run fast enough. That's when I woke up I was shaking all over.