Given the task definition and input, reply with output. 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.

story: Jarvis woke up early on Sunday because of noisy birds near his window. He spent the morning running errands. Later during the day, he felt sleepy and took a nap. However, this made it difficult for him to sleep on Sunday night. As he lay in bed, he felt angry at the loud birds.
selected sentence: However, this made it difficult for him to sleep on Sunday night.
Jarvis took a nap on Sunday noon >Causes/Enables> Jarvis could not sleep on Sunday night