Abstract: The present disclosure relates to a bed sheet and to an apparatus for securing a bed sheet or fitted sheet to a mattress. The bed sheet and apparatus, namely a bed sheet retainer set, preferably comprise a fitted bed sheet having four corners and a flat sheet. Both the fitted sheet and flat sheet are placed on a mattress above a box spring. The bed sheet retainer set preferably comprises a fitted sheet restrictor having cylinder with a slot and a base for placement between the mattress and box spring, four corner grips for use on the fitted sheet and two flat sheet grips for use with the flat sheet. The corner grips and flat sheet grips are preferably made of machine-washable foam with a rougher surface. The corner grips preferably each have a semi-circular base and a rounded corner wall. The flat sheet grips preferably have an hour-glass shape and rounded edges.