I have been debating with myself whether I should close my bedroom door at night or not. I prefer it open because the master bedroom tends be be colder than the rest of the house in the winter and having it open gets warm air in there better. However, having it closed might provide one more barrier or at least cover in case someone were to break in. That being said, there is no lock on our bedroom door so it wouldn't provide THAT much protection. Also, perhaps it would allow me to hear someone break in better if the door is open. The other side of the coin is that if someone does break in, I don't want my dog running downstairs right away to check it out in fear it would be dangerous to my dog or I would lose her hearing and her being able to tell me if something is still wrong downstairs.