Abstract: A bedding arrangement specifically designed for children's bunk beds, but useful in other situations where a bed is only accessible from one side, and where there is difficulty in tucking sheets under a mattress. The bedding arrangement comprises, basically, a rectangular mattress cover which can be secured to a mattress, and a rectangular insulating covering such as a blanket or bed cover attached, preferably sewn, along a rear one of its longer edges to a rear edge of the mattress cover. The arrangement also includes a sheet or liner foldable to produce two rectangular panels permanently connected along adjacent rear edges, the panels being similar in size to the mattress cover. Releasable fasteners are provided on the inwardly facing surfaces of the mattress cover and covering and which cooperate with releasable fasteners adjacent the margins of the outer surfaces of the sheet or liner panels.