Sleeping? What is that?

Prior to this week- Leila woke up every morning at 830am and took her nap from 1230-230. It was like clock work- it was wonderful!
This week Leila had a fever. So she was getting up in the night to take medicine on Tuesday and Wednesday nights. Then Thursday morning she slept in until 9am (we were going to the zoo, so I had to wake her up). She then didn't sleep a real nap that afternoon but went to bed on time. Friday she woke up at 830 and then napped from 1230-400pm (i woke her because we were going to Kings Island).
So last night she didn't get put to bed until 830- so I figured she would sleep in longer today. We shared a room with her and she woke up all talkative and sing-ie at 6am! oh Joy. where did my normal scheduled Leila go??