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How could he not hear them? Was he so busy worrying about other things that the career's conversations did not reach him?
He heard them making noise. He didn't pay attention to what they were saying. Also, after six days without sleep, even Clark is getting seriously sleep-deprived.

"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad."
"How do you know I’m mad?" said Alice.
"You must be," said the Cat, "or you wouldn’t have come here.”

- Lewis Carroll, Alice in Wonderland