Iruka receives an appreciative hum for clearing his line of sight. His hair would tickle sometimes, and he wasn't exactly in the position to keep raising his arms and move it.

He's left to calmly listen to the sounds of Iruka leaving, eyes opening only when he returned.

He quickly comes to the conclusion of a short mental debate, slightly sitting up so he can take the offered lozenge.

There's a nod at Iruka's final statement. The darkness will definitely help him sleep.