It is the fact that it is happening early in the morning that worries me. People aren't fully cognizant when they are woken up in general, and also aren't expecting anyone to be ringing the doorbell at that hour. I think fearful and violent people will be more likely to overreact in that situation.

All the cases of shooting food delivery workers for ringing the wrong doorbell that I've read have occurred late at night, and I think early in the morning will be even worse.