Additionally, changes in bl00d circulation during pregnancy may make muscles more touchy to cramping. For many women, these nighttime cramps become one of the most annoying sleep disturbances of pregnancy.

3. Athletes and Physically Active Individuals
It might seem amazing, but even people in wonderful health—such as athletes—are highly susceptible to night cramps. Intense training, prolonged exercise, or inadequate recovery can leave muscles fatigued and dehydrated. When fluid and electrolytes are depleted through sweating, the chances of cramping grows dramatically. Athletes who push their bodies hard without enough stretching or hydration often seek themselves waking up in the middle of the night with painful calf or foot cramps.