Why did the boys find Dally in the bedroom?

The boys found Dally in the bedroom because he was sleeping.

"Oh, shoot, kid"--- Dally glanced contemptuously over his shoulder--- "I was in the bedroom."
He suddenly stared at me. "Glory, but your ears can get red, Ponyboy."
I was remembering what usually went on in the bedrooms at Buck's parties. Then Dally grinned in amused realization. "It wasn't anything like that, kid. I was asleep, or tryin' to be, with all this racket. Hank Williams"--- he rolled his eyes and added a few adjectives after 'Hank Williams.'

no i do not have an answer to this question sir.