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Jay Leno, Tonight Show

Paul Drinkwater/NBC

Swine flu what?? There's only one thing that could knock out Jay Lenoexhaustion.

"I think it's one of those deals where you just kinda just got worn out," the Tonight Show host revealed to People.

Leno, 58, was hospitalized for two days late last month, forcing him to cancel two shows for the first time in 17 years.

In addition to his late-night gig, Leno does his stand-up routine 160 days of the year and writes columns for the London Sunday Times, Popular Mechanics and a British magazine called Octane.

"Exhaustion. That's like a rich person's condition. Poor people that work—they don't get exhausted. Only rich people get exhausted. It's an embarrassing thing," he joked.