The present invention generally relates to passenger aircraft seats. The disclosure focuses on a seat unit arrangement (10) for a cabin and seat units that provide different comfort positions. In some embodiments, a side cushion (14) forms part of a bed surface when the seats are converted to a bed position. In some embodiments, a bed extension (30) is deployed from a stowed position to form a part of the bed surface. In some embodiments, a seat backrest (22) does not form part of the bed surface when the seat unit is in the bed position. In some embodiments, a lounge position is provided when the seat backrest rotates toward a side cushion. In such an embodiment, the passenger may be positioned toward the side cushion such that the passenger may comfortably rest their legs on the side cushion without converting the seat to a bed position.