Deserts roar in the night while mountains sleep in tranquillity.”

This is a poetic sentence that contrasts the perceived stillness of mountains with the perceived noise of deserts at night. 

“Deserts roar” may refer to the sounds of wind, sand, or animals that are more audible in the quiet of the night, while “mountains sleep” suggests a sense of calm and serenity. 

The sentence may be interpreted in different ways, depending on the context and the perspective of the reader. It may also evoke different emotions and images, such as a sense of awe, wonder, or solitude.