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The same thing happened to me, but not as badly (I still could hear a bit). However, it never occurred to me that it might have something to do with Myasthenia gravis (I have ocular Myasthenia). Blaming it on the air conditioning and high humidity (I’m retired and live in Bali, Indonesia), I put on a t-shirt and socks at night and took extra vitamin C with zinc, which altogether helped.