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I discovered this while trying to sleep on a plane: Just at the point I'm about to fall asleep, my hearing seems to shut off. I've also notice this in my bed at night with a fan or sound machine on. The sudden silence actually wakes me up. Can anyone explain what's happening with my hearing?

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I discovered this while trying to sleep on a plane: Just at the point I'm about to fall asleep, my hearing seems to shut off. I've also notice this in my bed at night with a fan or sound machine on. The sudden silence actually wakes me up. Can anyone explain what's happening with my hearing?	1