"Erm... I dunno, I just know they gotta sleep. My mom always lectured me on it when I wanted to stay up and during that time of the month, she complained I never got my bed time." So he was very aware there was on... just not when it was. He looked at Harry, trying to guess. "Eight... Nine? Eight thirty. That's a good bedtime. Did you have a bedtime before, Harry?"

Harry shook his head and leaned closer to Sirius, unsure with a new person around and eager to be close to Sirius. "I usually just sleep when the lights go out but I don't have a clock so I dunno when that is."