I've had this for about 20 years, but it's got worse (and in my arms too) since I've been on hrt. I've tried a load of meds*, but so far the only thing that helps (sometimes) is mollasses. It's driving me nuts, messes with my already messed-up sleep (I have CPTSD, and Asperger's, and idiopathic neuropathy).
*gabapentin, pregabalin, ropinirole, quinine...