I have slept:

--on two duffel bags full of steel helmets while riding the back of a deuce-and-a-half.

--in a covered foxhole in Colorado after the detonation of a (simulated) nuclear bomb nearby.

--in a Quonset hut in Korea with the oil stove out and the outside temp at better than -25F.

--on an air mattress floating gently upon a sea of mud inside my tent.

--outside, in a cloudburst/tornado-spawning storm, after a temp drop from the mid-90s(F) to the upper 40s (F), with nothing but my clothes and my M1919A6 machine gun to comfort me.

--literally in the mud when the temperature was in the 30s (F).

--outside in a snowstorm wrapped in a wool blanket.

--inside, during a tear gas attack (woke me up!).