J.U.S.T. Sleeping District? Lazdynai for Lunatics is the practical element of the course “The Production of Space in the Digital Age” on the Masters of Critical Urbanism at the European Humanities University in Vilnius. The course explores both the potential that digital mapping technologies offer for critical studies of spatial issues, and also considers how digital technologies are impacting on ways of perceiving, managing and experiencing spaces. The JUST project is developed in partnership with Architektūros fondas, and makes grateful use of their local insights and expertise in the history of modernist architecture in Vilnius. It also seeks to add another layer to work on Lazdynai done by the Vietos.org project that interviewed residents about their perceptions of where they live and, on the basis of the evidence thus gathered, developed design propositions for the district.