Sounds like what I get Sometimes - a pinched nerve (which is what my physician says what you are discribing numbing like leg asleep but pain on moving) . There is no test for it. I get pinched nerves in my lower back sometimes to the point where I can hardly move so I have to use my crutches for a week or two. Pinched nerves can happen from sitting the wrong way for extended periods of time - like sitting at a comupter all day on a wooded chair with very little back support and cushons or turning part of the body too fast and in a direction you wouldnt normally move in. I also get pinched nerves from sleeping in odd positions and or on a mattress that is too hard or firm for my back. I have managed to cut down on the pinched nerves by taking walking around breaks when I have to be sitting for any huge legnth of time, sleep on an air mattress instead of an innerspring mattress. When I do have a pinched nerve 2 Tylenol ( extra strength) every four hours takes the pain away.