When sitting if I lean forward for just a minute or two my legs become numb, I ve also noticed that for example when laying on the couch if I have my hand raised above my head, not even under my body or head, it will go numb after a few minutes. I also have really bad almost crippling cramps in my feet and hands, when they cramp my toes will bend inward or in my hands my hand will be stuck in a specific position
Dear it seems to be a muscular disorder. I would recommend you to be examined with an electromyography which is a non invasive examination and blood test (CPK) and if them are ok there will be nothing to be worried