Vader had chose to remain in the same medic room as Luke. Did he tell the medics he had to be in his own cabin to sleep? No. It wasn't like the would understand why anyways. He needed his hyperbaric box for "sleeping." The best he could now, especially with Ivan's limited intelligence, was getthe bear to fetch the right objects. Like the Oxygen tank currently taking over his breathing so he could fix his filters. Vader had managed to convey that Ivan needed to grab his spare mask- which had taken the place of the broken one sitting in the corner.
Mostly, he watched Luke sleep. Sometimes only in quick glances, but he gaze was fixated on the boy now, as if the rest of the room fell away and left him in the void with his sun.
Okay. He's going to try something... probably stupid, but that hasn't stopped him before.
Vader hitches the oxygen tank onto his back, slowly unfurling himself and creeping over to Luke's sleeping form. He would set the oxygen tank back down, and would lay back down near the boy's head. A few moments passed, and Vader's cold, metal arms move, [u]attempting to pull Luke's head to rest between his forelegs- like a lap, perhaps.