A circular "No Sleeping" prohibition sign, featuring a black pictogram of a recumbent figure with two "Z"s on a white background intersected by a red circle and diagonal slash, is affixed to a transparent window

A circular "No Sleeping" prohibition sign, featuring a black pictogram of a recumbent figure with two "Z"s on a white background intersected by a red circle and diagonal slash, is affixed to a transparent window. The scene is observed from within a vehicle or structure at an airport on a clear day in Hòa Cường Ward, Da Nang, Vietnam. Through the window, a tarmac is visible, displaying a distant white ground support vehicle or bus and a red flag. Interior elements include a light grey overhead panel with a ventilation grille and a rectangular light fixture containing six small circular lights, a rearview mirror partially reflecting an external scene, and a light grey window ledge. Partial red LED lights are visible on the far right, outside the window.