It's like a creeping tingling its really hard to explain, on one site the lady said it felt like ants running in her bones, that's probably the best explanation of it, it's horrible, it's in the legs mostly but the whole body can be affected and unfortunately that's what's happened with me, it's worse in my chest, shoulders and arms, it's the most horrible feeling and it's keeping me awake for hours, once I get into the early hours it eases off so I can sleep. Also I feel like I can't breathe when I lay down so that doesn't help. Xx