Planes never sleep
Iberia has published on its corporate blog this very interesting video about what goes on in an aircraft during the night, when it rests at base.
With the name "Los aviones nunca duermen" ("Planes never sleep" in Spanish), you can see how ground crews take care of an Airbus cleaning and maintenance throughout the night...the video is in Spanish but, even if you don't understand the language, there is plenty of interesting footage of that part of airline operations you usually do not get to see!