Recent research by Dr Dirk Jan Stenvers of the Department of Endocrinology and Metabolism of the Amsterdam UMC indicates that sleep problems in teenagers can be reversed in just one week by limiting screen use. Dr Stenvers said, “Adolescents increasingly spend more time on devices with screens and sleep complaints are frequent in this age group. Here we show very simply that these sleep complaints can be easily reversed by minimising evening screen use or exposure to blue light. Based on our data, it is likely that adolescent sleep complaints and delayed sleep onset are at least partly mediated by blue light from screens"