A bed sheet and a bed cover are often confused for each other, but in reality, they’re quite different. A bed sheet goes under your cover and below your duvet too. It is quite literally what you sleep on, and doesn’t serve the same purpose as your bed cover. A bed sheet’s role is to cover your mattress. A bed cover on the other hand goes above all that and covers your sheets, duvets, and more to protect your entire soft furnishing set from dust and whatnot. It can be thought of as the final layer.