The Causes of Leg Cramps at Night During Pregnancy
Toward the end of the middle trimester and throughout the last one many women are awakened by knot-like cramps in their legs.
Sometimes the causes of leg cramps at night during pregnancy are blamed on an electrolyte imbalance of calcium, phosphorus, magnesium and potassium.
An additional explanation is the decreased circulation to the most active muscles in your legs.
Pressure of the uterus on major blood vessels, as well as standing, sitting or lying for a long time can slow blood supply to these muscles, causing them to cramp up.