Even if Luke and even Artoo are mindful of his sleep, the soft chirping is enough to get through the haze in Cal's mind. He blinks his eyes open, but doesn't move at all for several seconds, just looking at the wall ahead as he listens to Luke and ... a woman's voice? Is that Leia?

He yawns, and turns over onto his other side again, gathering the covers tighter around him. It would be easy to fall asleep again, but if Luke is awake, he'd rather wait for a bit. Unless Luke has any plans to do something very much like him like leaving to get some lavish breakfast, Cal fully intends to make him get back in bed for more sleep.