An theory of how make an natural cold room in the hot desert

And for some desert that are so hot in the day that it had something that is radiation of cold during the night, so the heat is where the sun touch the sand but the cold radiation of the night is in all the desert sand, so if you make a tent that during days don’t move of the place for many days and that is almost sealed to don’t dissipate the cold of the nights the cold would be preserve and get accumulated, to make the room (the tent) cooler and cooler, working even to keep food, the thing that is accumulated is the cold and not the radiation. Rute Bezerra de Menezes Gondim