People who die of hypothermia strip naked right before they freeze to death. ‘Paradoxical undressing’ occurs in nearly half of all hypothermia deaths. One theory is that your blood vessels, which constrict to direct blood flow to your inner organs, eventually tire out and open up when the body gets exhausted, causing a hot rush of blood to the skin. Another theory is that extreme cold messes with the brain and alters your perception of temperature, which makes you think you feel hot while you’re actually freezing to death. Source