Asides from "Deconstruction" as others mentioned, "Voices in the Dark" arguably should be watched after "Sleeping in Light" as well. It's not a traditional frame, like In the Beginning or "Deconstruction", but it still has one.
How so? I think what most of us promoting SiL as the final item to be viewed are looking at things from a primarily chronological point of view. Given that, there isn't anything except "Deconstruction" which can be considered, from that frame of reference at least.