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: Cheryl had a headache. She took some Tylenol. An hour later, it was not better. She took a nap. She felt better when she woke up.
 selected sentence: She felt better when she woke up.

Cheryl takes a nap >Causes/Enables> Cheryl wakes up