[So the reason why the servant demon doesn't respond immediately would be:
1. It's fairly early in the morning. 2. He's still a worthless, useless human. 3. By now he's reluctantly accepted that he does need to do ridiculous things like eat and sleep regularly. 4. He's still not so good at the "regularly" bit. 5. So when he does sleep, it tends to only be when he really needs to. 6. He's currently asleep. Sitting by his writing desk, because what is comfort.
It's not that difficult to find out which dome is his, though. Or to get inside, because what is caring enough about your possessions to lock doors.]