An area rug under the bed is the most common placement, but depending on your room size and furniture layout, you have room to get creative!
Placing an area rug under your bed gives a nice focal point to a bedroom. It instantly makes the space feel more cohesive. You can either place the rug all the way up against the wall to the headboard, or stop short of the side tables. It depends on how much space you have and other bedroom furniture you want to place over the rug.