Sadly this isn't from sleeping in a bad position and isn't clearing. The left hand side going numb is from 2 trapped nerve roots at C6 & C7 in my neck, from severe OA. And they are only going to get worse. Nothing showed up on the CT Scan to indicate why it is happening in the right hand side though. This is a case of if I don't get surgery, I'll loose the use of both arms and a few other bits like being able to regulate my body temperature and such. And at the speed it is deteriorating, by the New Year, it could be gone for good.
My legs both go numb if I lie on my back without anything under my knees. That clears the instant I move position, again indication of nerve root problems not blood supply, but it isn't as problematic as the neck issues. The neck issues are not clearing when I move and I now have permanent tingling in my hands and fingers (except the little finger, which is classic C6 & C7 nerve root issues, the little finger is C8)...