red grave electric beds An adjustable bed, as the name implies, is simply a bed that can be adjusted. You can adjust the sleepers position from a 100% flat to a sit-up position to the a feet-up position to even a both head and feet up position (aka lounging position or zero-gravity position). The majority of the beds do this by utilizing electrically operated motors while a few 'old-generation' adjustable beds have to be adjusted manually.