Nadine Sierra summits another peak of the soprano repertoire as Amina, who sleepwalks her way into audiences’ hearts in Bellini’s poignant tale of love lost and found. In his new production, Rolando Villazón—the tenor who has embarked on a brilliant second career as a director—retains the opera’s original setting in the Swiss Alps but uses its somnambulant plot to explore the emotional and psychological valleys of the mind. Tenor Xabier Anduaga co-stars as Amina’s fiancé, Elvino, alongside sopra...