Paresthesia is a symptom of Neuropathy, so definitely worth mentioning to your Neurologist. I get it often in both lower legs and lower arms,. my arms/hands often most affected in sleep. I wake up thinking I’ve had a stroke, and it takes a couple of minutes to shake and massage it off to where I can move the arm and fingers. I get similar type weakness in legs too, sometimes no rhyme or reason to what provoked it, I try to be careful how I position my arms during sleep so as not to pinch nerves or cut off circulation. The article Ananda posted is a good read.