Jay Leno has revealed the mystery illness that sidelined him last week: exhaustion. He blamed the The Tonight Show, his tough stand-up schedule, and writing jobs—he writes three columns too—for his first sick days in 17 years. It was still "embarrassing," he told People. Exhaustion is "like a rich person's condition," he said. "Poor people that work—they don't get exhausted. Only rich people get exhausted."