you feel numb after you wake up since your body needs time to warm up. you feel numb after sitting down for a long time, and when you stand up and feel your legs hurting you can say “i feel numb”. do you get the reference?
you know the feeling when you’ve been sitting in an uncomfortable position for a long time and when you stand up your body is in pain and its hard for you to walk for the first minutes? it’s what “numb” feels like. it’s similiar to being paralysed but less serious, it goes away quickly once you star moving around