[quote=Montanero]

"Camp site selection can help. Camp on the south side of hills that have been in the sun most of the day. The ground and rocks will radiate heat for a time. Camp out of the wind. Do not camp in low ground and close to water, cold air sinks and the water will cool things a bit. Camp part way up the sides of hills above the cold air layer in the valley."

Sleep where the deer sleep. You will notice their beds in the places Montanero suggests.