I was walking through hallways of an empty hospital, where there was only 1/5th of the lights on. I was wearing a hospital gown and a portable oxygen tank.
Dreams about hospitals generally reflect the state of your physical or emotional health. However, since this hospital was empty, it could represent feelings of loneliness or isolation in your waking life.
The fact that there were only 1/5th of the lights on suggests that you may feel directionless or uncertain about your path in life. The hospital gown and portable oxygen tank may symbolize that you are currently dealing with a health issue or other challenge that requires support.
Overall, this dream may be a reflection of your current feelings of vulnerability and uncertainty. It may be helpful to take some time to identify any areas in your life where you may be feeling unsupported and seek out the help and guidance you need.