The U.S. air transport industry is largely united behind a proposal to allow "controlled napping" for flight crews in the cockpit. Some international carriers already allow the practice, which until now has been strictly forbidden by U.S. regulators. But as the FAA weighs new rules on pilot rest, napping at the controls is getting a second look. Many experts say it's about time: "There's no question it produces better pilot performance at the critical phases of flight," says Gregory Belenky, a sleep scientist at Washington State University.

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