One of the ways that your body regulates its temperature is through blood vessels in your skin. If the brain decides the body is too hot, it will dilate (widen) blood vessels (vasodilation), redistributing warmer blood from the body's core through the rest of the body to cool it down. If the body is too cold, the brain signals the opposite reaction, restricting the flow of blood to the surface (vasoconstriction).Researchers have shown that warming the feet before going to sleep using a warm foot