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Sleeping on a plane feels impossible for most travelers, with cramped seats, crying babies, and neighbors reclining into your lap making rest seem unattainable. At 35,000 feet, shut-eye often feels ...

A cramped middle seat, flickering TV screens, and the slow parade of beverage carts aren't what anyone would call sleep-friendly. Sure, no one's expecting to get deep, luxurious rest on a plane. But ...