The bodies of hypothermia victims are often found “hidden” in odd places such as closets, under beds, or behind furniture. This is a primal, evolutionary response called “hide and die” which victims experience moments before they perish. – WTF Fun Facts
Source: Hide and Die: The Disturbing Behavior of Hypothermia Victims – Wakelet
Dogs do this hide and die process too.
Or maybe they just want to find a fucking warmer place???