Prairie Doc: Midnight muscle cramps?

Here’s what your body is telling you

You’re asleep when suddenly your calf tightens into a painful knot.

You swing your legs over the side of the bed and stand up, trying to stretch the muscle and waiting for the cramp to release. It passes after a minute or two, but the soreness often lingers. These types of nighttime leg cramps are common and often harmless, but disruptive.

Studies suggest that up …