Abstract: A portable collapsible vehicle roof mounted sleeping compartment including a plastic housing with front and side walls, open rear, and a hinged top mounted on spaced rails clamped to a rack removably attached to the vehicle roof. Slidably telescoping within the open rear of the housing is a drawer-like section having a rigid bottom and top wall expandably interconneced thereto by flexible windowed side walls, flexible rear curtain, and a hinged rear wall. Telescoping sections in said rails are longitudinally extendable with telescoping legs hinged to the ends thereof for ground engagement to support the drawer-like section relative to the vehicle roof when extended, with the latter supporting the hinged top in angular elevated position, and entry being gained through the lowered hinged rear wall.