Charlie Horse!

So this morning I had a very rude awakening (15-20 min before my 5am alarm no less). My left calf went into an awful spasm that took about 30 sec to let up. I couldn't do anything but lay there and pray it would stop! I started the day with a limp; it's gotten better but I'm still sore like I did a leg workout. I've heard of bad leg cramps in pregnancy and I know my mom told me she had them with me. Do any of you ladies deal with this? Have you found anything that helps? TIA!