Ergonomically adjustable recliner

A lying device for variable adjustment between a substantially horizontal position and an ergonomic sitting position comprising:

• a right side part and a left side part, each of which comprises at least an outer side part and an inner side part;
• a backrest element and a seat element, which are rotatably connected to each other via a first bearing block;
• and
• a foot element rotatably connected to the seat element via a second bearing block, the foot element being supported between the right and left side parts via a third bearing block;
• wherein the first, second and third bearing blocks are each mounted in a corresponding guide in the right and left side parts so as to be translatably movable in such a way that the backrest element, the seat element and the foot element are variably adjustable between a substantially horizontal position and an ergonomic sitting position, and wherein the first bearing block is lockable by self-locking via a movable locking slide in a locking recess in at least one outer side part, and wherein the self-locking can be cancelled by the user via at least one hand knob.