$jason = my roomie

Me and $jason live in a 2 bedroom basement, each with our own room and mine is closer to the door.  
I'm a working freelancer, and he was doing odd jobs until he recently got a job with more typical work hours.   
So we both have (had) odd hours and are usually up very late, I would often hear him up at 4-5am. Since he got that new job he has obviously been on a more regular sleep schedule.   
So last night I'm sitting in my room getting stoned and doing some computer work and I hear knocking on the door.  after the 2nd knock and $jason doesn't get it (I'm not expecting anyone), I open the door and it's his friend. He's looking for $jason. I tell him I have no idea if he's home (or sleeping), I haven't seen him today. He knocks on his door and I kind of go back to doing my own thing and then he leaves. Some time later this guy knocks on the door again and I let him in. He inquiries about him, I tell him I still have not heard anything,  knocks on his door and then leaves.

Sometime later I hear $jason come out of his room, I open my door and tell him that his friend came by. He was  very pissed and says yeh thanks for waking me up. He asks why would I let someone in at 12:30am?  
I shoot back that I'm not gonna get mixed into his business and it's up to him to tell his friends not to come by after midnight (or whatever time).  


My feelings are that I don't know if he's expecting a friend, or would be happy to see someone or wouldn't. I don't want to care about that. If someone knocks on my door I will answer it, and if its someone that I recognize and have seen here before with $jason, I don't see a reason to not let him in. I was also totally oblivious to the time when this happened (as I said, I was high).  
Now all of this is obviously unless he specifically tells me, never let in anyone after whatever time. I can respect that.