No: It has nothing to do with your heart - mostly likely you're having common nocturnal leg cramps - can happen with dehydration, diuresis, and overstretch/overuse. Try walking until they resolve. At the first sign of return, "flex your toes in the direction of your nose" (ie bend your foot upward) to immediately relieve the cramp. Everyone gets nocturnal leg cramps sometimes.
Answered 1/3/2016
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