So this weird thing happened to me while sleeping, where my calf muscles involuntarily flexed, and stayed that way for a couple of minutes. And the intensity of the contraction was really really strong, so much so that it really hurts. It's happened to me before, and sometimes it leaves me okay, and other times, it lasts so long that I have a sore leg for a couple of days. Does this happen to any of you? What can I do about it?