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"I've got to be able to teach my people that they can't necessarily throw off the pack every day after 16 hours in a combat environment," he said. "They are going to have to figure out how to manage the routine and their people and understand the risk of, who's on watch and, am I going to stand on this watch and you can fight, kind of a protracted action. And oh, by the way, retain sufficient reserve so if you have to do a big damage-control effort, a big resupply of the ship ... that they've got the skills to do that."

Studies have likened the effects of sleep deprivation to being under the influence of alcohol. The longer people go without sleep, studies show, the slower their reaction time and the more impaired their cognitive capabilities.

Davidson said he had been profoundly affected by the story of an Army friend who spent 96 hours without sleep during Operation Desert Storm, and detailed the torturous mental effects of that deficit.

"We've got to find a way to safely and proficiently test our people in higher fatigue conditions along the way," he said. "And we have to teach them the difference between fatigue conditions and those routine conditions as well."