First things first, always. Most common cause for spasms, twitching is an electrolyte deficiency particularly one of these three: Magnesium, Potassium, or Calcium. (could be sodium but usually never a problem unless it is too much). Also dehydration could be at fault so start with drinking more water period. Not juice, not soda, not coffee, not beer, actually water, as a matter of fact include a juiced 1/2 lemon in each pint of water.
Do you eat too many processed foods? out to too many restaurants? Knock it off for a while.
Take this as seriously as you would an extraction.
To restore hydration and electrolytes, eat and drink these: Coconut water, Celery, Watermelon, Cucumber, Kiwi, Bell peppers, Citrus, Carrots, Pineapple.