I also brought along my acoustic guitar and played for a while . Ouch , any callouses that I had built up from taking lessons are long gone from my fingertips . I also played on my harmonica a bit as well . All in all it was fun . I had a very hard time getting to sleep , and staying asleep .

Question: Why may the narrator have had trouble sleeping ?
Answer: None of the above choices .They were excited from playing music .Their callous started bleeding .Their callous kept blistering .