First and second rounds I had horrible calf cramps at night. Third round I had none, and so far, on my fourth round none also. I attribute it to adjusting to whole food eating, trying to add enough salt and get enough water. I found that I was eating a lot LESS sodium then pre-whole30. I had to add more salt to certain meals.
I also added in natural calm magnesium supplement, coconut water after intense workouts, and journaled to see any other relationship to the cramps. The good news is the went away after the first week.