8am too early?

[Theregoesmyliein]

DS (10)went for a sleepover last night as it's the school holidays. All arranged and made a nice change to us always hosting (DS has various mates staying over most weekends/holidays) and the kids will leave after lunch the next day.
We were having a nice lie in as we are off work for the school hols and heard a knocking a little after 8am. Turns out DS has been dropped off home! No behaviour issues or wanting to go home, just the hosts were going out today.
Aibu in thinking it's a bit bloody early? Sleepovers usually go on pretty late into the night as they won't shut up and go to sleep and the kids sleep in later. DS is shattered and was dumped on our doorstep so early. What if we hadn't heard him knocking (it did take some door hammering by him to rouse us). Or what if we hadn't been here for some reason - okay, less likely but still, it could happen seeing that we weren't expecting him back for quite a few hours.
AIBU? Or overreacting because I'm slightly grumpy at the early fright with the door banging?

8am seems pretty early, but the time itself isn't the issue - it's that they didn't tell you it would be then. I am a bit surprised that, as they were offering to drop him off rather than pick him up, you didn't say something as basic as 'what sort of time?', but given this is a fairly regular arrangement, I'd have thought they would have had the sense to say 'By the way, it'll be three hours earlier than usual'. They may have assumed you wouldn't go out that early, but if a child was in my care I'd make sure.