I do not answer the door if I don’t clearly know who’s knocking and do want them inside my home. If one is truly ‘lost’ at that time, do not rely on the kindness of strangers at that hour. Get to a police department or hospital or firestation. Otherwise, you are making a target out of yourself. 2.30am is working hours for the out of town faceless crook.
The way my house is situated, I can see whoever is at the front door from behind. I even put in an extra light switch so I can turn on the outside lights from the bedroom.