Detailed Instructions: In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
Problem:I think she is probably in a great deal of pain , as she is sleeping a lot . She also appears frustrated at having to re - learn how to walk , especially when she is sleepy . The vet has been closed since we picked her up Wednesday , so tomorrow we will call and see if she should be on pain medication . She does better when she finally wakes up at walking about , but she's been sleeping really heavily lately and frequently prefers to go back to sleep to waking up . 
Question: What may have caused her to start sleeping a lot ?
Solution:
She was trying to avoid the physical agony .