The possibility of being always connected to the Internet and/or the mobile network (hence the term "always-on") is increasingly blurring the borderline between physical and digital spaces, introducing a new concept of space, known as "hybrid." Innovative forms of teaching have been developing in hybrid spaces for some time now, but as yet no in-depth parallel reflection on the enabling conditions which can guarantee their mass diffusion has been forthcoming. This article proposes a possible model for combining the elements of so-called "always-on education" with the conditions which make it truly sustainable.