I've got surgery again myself at the crack of dawn.

"I just want to know why you're here at the crack of dawn."

They'll start a search at crack of dawn, I guess.

He had to have some sleep, but at the crack of dawn he'd be on his way.

"What are you doing here at the crack of dawn?"

I'd been working constantly since before the crack of dawn.

Why are these things always at the crack of dawn?

Getting up at the crack of dawn for an early morning run?

Today she was up at the crack of dawn, 4.30, to make breakfast for her man friend.

There had to be some advantage to getting up at the crack of dawn.