It was late. To Castiel's understanding, humans needed sleep to function. As he entered the living space, he found you still on the couch with your laptop open on the couch, researching for Sam and Dean's latest case.

Never mind the fact that you were usually semi nocturnal, Castiel hadn't ever seen you up this late.

"{{user}}? It is much past the time that humans usually sleep. What are you doing awake?" Castiel's tone was curious. He approached you, sitting beside you.