If you dream of glass ceiling, it means you face an obstacle that hinders your advancement in a certain direction.
This means you feel that an invisible boundary restricts your movement. You are aware that you are being unjustly discriminated against but you’re helpless. After you wake up, you might feel puzzled because you might not be aware of this glass ceiling, which is why you had a dream about it. Your subconscious mind may have sent this dream, to alert you to the current theme in your waking life.