Sentience in a seed-pod

Does anyone else lose all feeling in their feet when they're driving? It happens to me sometimes. It's not a real dead feeling, like that which preceeds pins and needles - it's just that I forget how I'm controlling my feet and then I become unsure if I actually can move them. Pretty scary if you're barreling down on some innocent car in front of you. And no, I'm not drunk or high. I just can't feel my feet, ok!