My neighbours upstairs have recently got into a habit of ringing my doorbell at night to be let in in the communal door (I live in a converted house). I am sure there’s someone in their flat as they have a baby. I have my own toddler and the last time I answered I was in my pyjamas looking very tired and my daughter awake because of them. They apologised and said they forgot their keys which doesn’t make sense as the door locks after it’s shut which supports the fact that someone’s is at their flat to open it. it’s happened again few nights ago, with them ringing it twice. it’s just getting on my nerves as they keep waking my toddler who’s not the easiest to get to sleep.