This layout shows a set or assembly of aircraft seats to outfit an aircraft cabin, comprising at least two columns of neighboring seats. The seats are arranged one behind the other in each of the columns of seats. Moreover, each seat can be converted into a sleeper so as to present a considerably stretched out sleeping surface. Each seat when converted into a sleeper, has a first sleeping portion and at least a second sleeping portion that is narrower than the first. In two neighboring columns, the seats are staggered, in such a way that the first part of a seat of a column is facing a second portion of a seat of the second column that is narrower in width.