Being nocturnal is an adaptation that desert animals survive because

It is easier to function at night in the desert since the temperature drops. This way, animals can eat at night which wastes less energy on body temp regulation. They sleep during the day when the temperature is high and hard for the body to handle without wasting too much energy.

The answer should be geothermal i hope i’m right message me if i’m wrong and i’ll change my answer and fix it for you