A bedding assembly includes a cushion, a cushion cover, a top cover and a coupling unit. The cushion has opposite lateral surfaces. The cushion cover accommodates the cushion and has opposite first and second cover portions that are respectively adjacent to the lateral surfaces of the cushion. The top cover is laid on top of the cushion cover and has opposite first and second side portions that are respectively adjacent to the first and second cover portions of the cushion cover. The coupling unit includes a first coupling subunit that separably couples the first cover portion to the first portion, and a second coupling subunit that separably couples the second cover portion to the second side portion.