Sentence 1: Nancy's life began to bring more stress than she was used to. 
 Sentence 3: She couldn't focus without sleep, so she visited the doctor 
 Sentence 4:  Her doctor prescribed her with insomnia medication 
 Sentence 5:  The medication worked, and Nancy was happy to sleep well again 
 Option 1: Nancy was so stressed that she began to have trouble sleeping. 
 Option 2: Nancy become so bothered that she began to sleep more.