The evening shift may leave a muddle behind for the night shift to sort out, and the night shift may get its own back by bequeathing a worse mess for the day shift.

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Shifts should rotate clockwise, from day to evening to night shift.

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Expect some more details from Ballmer on that major shift this evening.

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"We have had to add beds in the hallway, " said Dr. Xu one recent evening after a 10-hour shift.

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Two to three cars work a morning shift and three or four patrol the Atlanta airport in the afternoon and evening, said Delta's Michael Cousin, who supervises the airline's car shuttle.

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