An article of bedding comprising a bottom sheet (11) having side walls (12) thus to form a box sheet to be placed elastically over a mattress (10), and a top cover (14) having its edges attached to those of the bottom sheet (11) by means of a gusset (16). A sliding clasp fastener or the like (15) is provided to attach the edges of the bottom sheet and top cover together respectively when the article is not in use. A pillowcase (18) is permanently or removably attached to one end of the sheet and has an opening for insertion and removal of a pillow. The entire article, possibly excluding the pillow, is preferably of machine washable materials. An article made in this way ensures that the top cover which may contain a duvet, cannot slide off the bed inadvertently and therefore the occupant, most likely a child, is kept warm and safe from falling out of bed whilst having freedom of movement within the enclosure formed by the bottom sheet and top cover.