Sleeping, but rabbits generally sleep with their limbs spread out on their stomachs or on their sides. As you said, there are two situations when sleeping with limbs buried under the body. One is that it is cold and needs to be fed. It was placed in a slightly warmer environment, and foot pads were added to the nest. One is that it has just arrived in a strange environment and is unfamiliar with you and the surroundings, so it sleeps in this self-protective form.