It is a lack or circulation that causes that feeling. The lack of blood flow sends a sensation of freezing in the body. Simply moving around will help.
You could have a condition such as Multiple Schlerosis and need medical attention. You may be suffering from Reynard's Syndrome in which blood vessels constrict in response to cold.
The freezing is due to the dehydration. When fluid content is cut shor your body finds it hard to fluctuate,leading to this prolem. Drink lot of water. Good luck.
