Shin/Toe cramps?

[Catrin]

Trying to chase down what might be going on here. Last night before bed I had the oddest "cramps" (for want of a better name) on the bottom part of my left shin (NOT the 'bad knee' leg. Then in the middle of the night I woke with the oddest muscle spasm in the top of my left foot with all of my toes drawing back toward the top of my foot. I've had this at night before, but THAT was in the bottom of my foot with the toes curling under, not backwards.

I suspect it's a sign of some deficiency in my diet and have so far not been successful finding information. Potassium or magnesium perhaps? Has anyone experienced this type of "cramping" before? Just curious. Also just grabbed a couple dried baby bananas for the potassium.