Sleeping in the headphones on an airplane is a challenge, though they produce odd noises, including a whistling sound, when I leaned my head against certain surfaces, and sleeping on my side was out of the question.

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But there are tantalizing signs as the FDA prepares to review suvorexant that this drug may be fundamentally different from current sleeping pills like Ambien, Lunesta and Sonata, lacking their rare but troubling side effects, like memory loss and sleepwalking.

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