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: Tim couldn't sleep in the dark. He needed a night light. Without it he would have nightmares. One day he was so sleepy that he forgot to turn it on. He realized he was now brave enough to sleep without it.
 selected sentence: One day he was so sleepy that he forgot to turn it on.

Tim goes to sleep >Causes/Enables> Tim forgets to turn the night light on