Nocturnal ankle cramp is a relatively common nuisance, which may have many different causes. Although some cases are caused by a disease called nocturnal leg cramps, others are caused by repeated exertion and strain of the calf and tibial muscles during the day.
for the best results, please consult your doctor about your symptoms and ask if these specific exercises will help your ankle cramp. 
ankle cramps can seriously interfere with good night sleep. (picture: catinsyrup / iStock / gettyimages) when the muscles around your ankle tendons start to stiffen or contract unconsciously, you will have ankle cramps. This is because of a failure in the functional integrity of your lower motor neurons and muscle fibers. In other words, a slight injury or disorder to a nerve or ankle muscle interferes with the normal information the brain sends to the foot. Although most nocturnal leg cramps occur in the calf muscles, the muscles in the feet may experience sudden involuntary contractions. Once your muscles stop twitching or contracting involuntarily, you can gradually begin to stretch the muscles around your ankles.
ankle round stretch
the American Academy of orthopedics recommends stretching and relaxing your calf muscles, tibial muscles and ankle tendons. From standing upright on a wall or other stable surface, lift your ankles a few inches off the ground. Slowly turn your ankle and let your toes draw a large clockwise circle in the air. Continue to rotate until you have completed at least 10 turns, then reverse the motion and repeat the turns counter clockwise. Move your toes
the toes are slightly more complex than the ankle joints and provide deeper extension for your ankle tendons. To start again, lean your weight against your cramped ankles and lift them up with your toes down. Keep your arms, legs and upper body stable and your toes down as much as possible. Slowly raise the toes so that the feet move up as far as possible toward the calves and repeat as many as 10 times as necessary. Once your ankle feels comfortable, you can try writing letters in the alphabet with your toes in the air for toe writing exercises. To maximize stretch, try to keep the rest of the body as you rotate the ankle. Try your child's posture
children and 39; s posture, or Balasana, is a gentle ankle and leg stretch that can be done on the floor or on a yoga mat to help relieve ankle cramps.
Yoga magazine recommends starting this position, kneeling on the floor, toes together, knees as wide as hips. Sit on your heels and slowly place your torso forward and down between your thighs. Place your hands on the floor, palms up, and slowly relax your shoulders toward the floor along your torso. As you exhale, expand your sacrum so that your hip joint points snuggle up to the inside of your thigh. Take a deep breath for 30 to 60 seconds as needed.