Sweet dreams, airport

Night falls on Motortown, travelers and pilots finish their business and go to sleep. But why do the aviation ambulance, baggage tractor, sanitation vehicle, and other special transport at Midnight Airport not sleep?
From sunset to dawn, they roam the airport, repair airplanes, deliver food, and know no moment of rest. With the sunrise, Midnight Airport closes the hangar and waits for the day crew. It's time for the big machines to take a well-deserved rest.
Sweet dreams, little machines!