For a while now, I wake up every once in a while with major leg cramps or with one of my quads/hamstrings tingly, painful, and numb (I know it makes no sense-- numb to the touch and painful at the same time-- I guess it's sort of like frostbite). For the last two nights, my sleep has been REALLY erratic-- I've had to wake up several times, get up and walk, just to get rid of the bloodless painful feeling in my left quad/hamstring muscles! OK, so maybe this is nothing to some of you guys, but it's making me nervous-- it almost feels as if there's no blood flowing to those muscles when I'm lying down! I've been doing hack squats, squats, leg presses, etc., I just started doing hack squats a few weeks ago. THanks for any help...