Today is Nathaniel 's first day of school . I miss him , but I am sure he is having a fabulous day ! He was so excited about being back at school . He told me he was awake at about 6:00 AM and could n't get back to sleep .

Question: What may have caused Nathaniel to wake up at 6:00 AM ?
Answer: He was worried about his first day at school .He just could n't go back to sleep .He was anticipating today 's events .He was anticipating a day to miss school .