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 .
According to the above context, answer the following question.
Why may the narrator have had trouble sleeping ?


They were buzzed from playing music .