In less than a week, the cryptocurrency billionaire Sam Bankman-Fried went from industry leader to industry villain, lost most of his fortune, saw his $32 billion company plunge into bankruptcy and became the target of investigations by the Securities and Exchange Commission and the Justice Department.

But in a wide-ranging interview on Sunday that stretched past midnight, he sounded surprisingly calm. “You would’ve thought that I’d be getting no sleep right now, and instead I’m getting some,” he said. “It could be worse.”