With a less compelling performance from its lead, Good Night, Oscar would fall flat. Its first half suffers from a lack of urgency; its second is burdened by hacky late-night antics. Almost everyone but Hayes’s Levant is forgettable in both performance and characterizations. Hayes is a marvel, embodying Levant in voice, spirit, physicality, and, eventually, music. He shakes like he’s davening prayer, fidgets like he's inebriated, and yells like his mind has left him without a choice. Carolina Ortiz Herrera and Ben Stanton’s lighting design closes in on Levant as he hallucinates, fantasizes, and opines; these shifts, some subtle and some overt, call to mind the Brian Wilson biopic Love & Mercy, another exploration of both songwriting and schizophrenia. Rachel Hauck’s set serves as both recording studio and padded cell, further insulating Levant. Though the supporting personae fall flat, these design elements fuse with Hayes’s performance for a powerful and cohesive character study.