Deserts are usually very dry. During the daytime, the sun shines brightly and heats up the desert sand, raising the temperature extremely high. Because of the lack of water, deserts cannot support much vegetation. Due to this, there is fluctuation in temperate. During the night the sand loses all its heat and becomes cool. To stay away from the intense heat, desert snakes burrow deep into the sand during the day and come out only during the night, when it is cooler.