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I'm not a doctor so don't by any means consider this any form of diagnosis. I had a friend once who woke up and couldn't use his arm at all for 2-3 weeks. According to what he was told sometimes for some reason it just happens and usually straightens itself out. So hopefully that is the case with your wife. It's supposed to be more common than alot of people realize. If this happens to be the case then while it is definitely pretty strange it'll all be fine in the end.
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