Falling off the treadmill

Yes, Yes I did. So we have been training outside if the weather is good, and inside if the weather is bad. Well today we were running inside. I really wanted to get to the mile mark of running straight without resting. I had run .8 miles and my leg was going numb. I kept running and the numbness moved up higher on my leg. I was at .9 miles now and couldn't feel my right leg at all. I didn't care I was going to get to the mile mark. Well right before I did, my leg gave out and I ended up crashing and burning. That's right. So needless to say I don't think I will get back on the treadmill for a while.