For a few years now, I have been quite paranoid about people breaking into my house. I live in a rough town in the UK where many crimes have occured over the years, including house burglary and trespassing, and a few people who I have not got on well with have threatened to break into my house as well, so I worry about people breaking into my house on a daily basis.
Even in broad daylight when my mum and my brother are in the house, I always lock the doors and keep all of the windows closed. There are some people I know who leave their doors unlocked even at night.
I know I would never even consider leaving my doors unlocked during the day, nevermind in the middle of the night. I have an "On your own head be it" attitude to those people who don't lock their doors at night, because they are leaving themselves vulnerable to being burgled or kidnapped.
Who else worries about their house being broken into?