Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Last night I had a scary dream. It kept me up all night. I wasn't able to go back to sleep. Eventually I had to go to work. Now I'm tired and annoyed.
 selected sentence: I wasn't able to go back to sleep.

I have a nightmare >Causes/Enables> I can't go back to sleep