What's a decent opera in a foreign language to listen to while going to bed?

I like lighthearted ones such as the Barber of Seville or "Zar und Zimmermann". If you want more oomph, The flying Dutchman is a great choice. I also like Carmen and Nabucco for some really catchy melodies and the magic flute is nice too. Depending on what language(s) you speak, some of those will obviously not be foreign, sorry :-D