Contracting calf muscle in excruciating pain with toes balled up only when laying down. How serious is this?
These spasms are common and sometimes reflect exercise fatigue or not enough dietary magnesium or potassium. As long as you don't have kidney disease try a magnesium supplement and increase your dietary potassium with bananas, strawberries or arrange juice.
Sometimes tonic water at bedtime helps. If this doesn't work see your personal physician.