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: Each night, Joan's tiny dog ran to her bedside. Joan placed a stool so the dog could jump on the bed. Suddenly, Joan's dog stopped coming into the bed at night. When Joan turned on a light to see what was wrong, the dog came. Joan had to put a night light next to the dog's stool.
 selected sentence: Joan had to put a night light next to the dog's stool.

Joan's dog couldn't get into the bed at night >Causes/Enables> Joan put a nightlight next to the dog's stool