You probably hear it in your sleep. And, if you think that high pitched buzz is louder, this year, you’re right. It’s the mating call of the 13 year cicadas. The red eyed insect spends most of its life underground, feeding on the sap of trees. They don’t pose a threat to humans, except for the noise. But, they can damage trees and shrubs, when the females cut slits in branches to deposit their eggs.