"When I give a speech at a corporate event, I often ask those in attendance, 'Do you know how to tell if you're doing the job?' As heads start whispering back and forth, I provide these clue: 'If you're up at 3 A.M. every night talking into a tape recorder and writing notes on scraps of paper, have a knot in your stomach and a rash on your skin, are losing sleep and losing touch with your wife and kids, have no appetite or sense of humor, and feel that everything might turn out wrong, then you're probably doing the job.'"
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Source : Bill Walsh, Steve Jamison, Craig Walsh (2009). “The Score Takes Care of Itself: My Philosophy of Leadership”, p.26, Penguin