Calvin Simpson, who is homeless, takes a nap in the overflow room at the Atlanta Mission homeless shelter in downtown Atlanta, Georgia Jan 7, 2014. The mission reached it's capacity of 350 residents due to record low temperatures. A deadly blast of arctic air shattered decades-old temperature records as it enveloped the eastern United States on Tuesday, snarling air, road and rail travel, driving energy prices higher and overwhelming shelters for homeless people. [Photo/Agencies]