What does the verbal irony in this text suggest?
"Sleeping through the rooster's crowing was no problem," Dale joked with a yawn.

 - Dale finds roosters amusing.
 - Dale slept poorly.
The text uses verbal irony, which involves saying one thing but implying something very different.
Sleeping through the rooster's crowing was no problem ironically suggests that Dale slept poorly. Dale was tired, so the rooster's crowing was clearly a problem.