Many of us have had this dreaded experience: you’re asleep or lying in bed, minding your own business, when all of a sudden you feel an excruciating, twisting, tightening, pain in one of your calves.

Picture this: You’re lying in bed, *just* about to fall asleep, when your leg starts to cramp. The contractions, the twisting, the spasms, ugh! Naturally, you start to wonder, what causes leg cramps ...