Head Trips: "Night is a Room" and "Lazarus"
Do you have to understand a show in order to like it? I've been asking myself that question since seeing, back-to-back last week, Night is a Room, a cryptic drama playing in Signature Theatre's small Griffin space through Dec. 20; and Lazarus, the inscrutable David Bowie jukebox musical that is enjoying a nearly sold-out run at New York Theatre Workshop through Jan. 20. I found both to be oddly compelling, even…