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I have exactly the same symptoms as rlyons and I'd waved it off as shin splints until it started happening when I was in bed at night. Nothing aleviates the sharp pain but nothing makes it worse or seems to bring it on. I don't have any other shin pain and it doesn't happen when I'm running on the treadmill. It knocks me sideways everytime - it's such an intense pain. I think it might be a trapped spinal nerve and it's time to visit the doctor.