This reminded me of something that happened with myself and a friend a few months back. We were staying out for the Nintendo Wii at our local Target. We only had two blankets, cold pizza, one pair of socks, and two chairs. He became delirious and very weak. I tried to run, or do push-ups to stay warm, but nothing helped. We were both exhausted from it. After he got home, he went to bed for two days, and couldn't get up for another week. Strange eh?