It’s not silly if, even as an adult, a person is counting sheep to be able to sleep given the fact that in the US alone two thirds of the adults are having a hard time sleeping a few nights per week or more. “Insomnia is universal. Everybody has it at some point,” says Martin Scharf, director of the Tri-State Sleep Disorders Center in Cincinnati, Ohio, who labels insomnia, “the number one sleep disorder”.