Bed a piece of furniture

A bed is a piece of furniture or location primarily used or intended for sleeping upon, but also commonly used for sexual activities, relaxing, sitting, and reading.

Beds come in a wide array of shapes and sizes. Early beds were little more than piles of straw or some other natural materials. An important change was raising them off the ground, to avoid drafts, dirt, and pests.

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To make beds more comfortable the top layer is frequently a mattress. Originally these were bags of straw for most people and filled with feathers for the wealthy. Eventually new fillings such as cotton and artificial fillers became common. In modern times most mattresses use springs, solid foam, water, or air.

At the top of the mattress, to provide greater support for the head, most people use a pillow. Also used is some form of covering blanket to provide warmth to the sleeper, often bed sheets, a quilt, or a duvet.

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The bed frame may simply be made of wood or metal, but many also use springs. Most expensive and bulky, but also strong and comfortable are box springs, a large mattress-sized box containing wood and springs. A valance may be used to make the bed frame match the rest of the bedding.

Ancient Romans had various kinds of beds for repose. These included the following,

lectus cubicularis, or chamber bed, for normal sleeping;
lectus discubitorius, or table bed, on which they ate—for they ate while lying on their left side—there being usually three people to one bed, with the middle place accounting the most honorable position;
lectus lucubratorius, for studying;
and a lectus funebris, or emortualis, on which the dead were carried to the pile

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Most countries have a standard set of four sizes of mattress. While the Double size appears to be standard among English speaking countries, based on the imperial measurement of 4 ft 6 in by 6 ft 3 in, the sizes for other bed types tend to vary. The European sizes differ; they are based on the metric system.

A king-sized bed differs from the other sizes in implementation, as it is not common to have a king-sized box spring; rather, two smaller box-springs are used under a king-sized mattress. On a U.S. Standard or "Eastern" King, the boxsprings are identical in size to a Twin Extra-Long.

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