Is it safer to sleep with your bedroom door closed?
You will have a better chance to survive a fire.
If you leave your bedroom door open when you go to sleep and there is a fire, it could spread faster into your room. A closed door will give you more time to act and save yourself from the fire. It will keep the temperature in the room down to 100°F, which is a lot more bearable than 1000°F. In addition, the toxic smoke won’t spread as easily.