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 .

Based on the preceding passage, choose your answer for question Why may the narrator have had trouble sleeping ?
OPT:
*They were buzzed from playing music .;
*Their callous kept blistering .;
*None of the above choices .;
*Their callous started bleeding .;
The answer is:
They were buzzed from playing music .