As someone wrote to the Washington Post, "If celebrities are that tired, why don't they just go to a five-star resort and lie on the beach for a few days like the rest of us tired people would do if we could afford it?"
Eminem is the most recent example. He canceled his European tour due to exhaustion. But wait! We learn he's really in drug rehab.
http://www.eonline.com/News/Items/0,1,17184,00.html
Love those celebrities.