Are you thinking of shin splints? This wasn't the shin, it was the side of my lower leg and all around the lateral malaleous. It definitely involved muscles and tendons. Unually I get this in my calves while asleep. I haven't had one in quite a while. Sometimes it's just my feet, and my toes pull and distort in all directions. It's very painful and looks extremely weird when it's my toes.
Had a better night last night but woke up before 5 a.m.
Karen