If your practical life is based on illusion, no matter how you seem to keep your feet on the ground, they are truly in the air.
You are bound to fall.
You are dreaming, and the ground where you believe to stand, including yourself, will vanish as soon as you wake up.
However, if you are aware of your dreams, and there is a luminous one which you truly like, then you can decide it to be part of your practical life.
No matter how impossible it seems to be, you can gather the courage and determination so that your dream keep its feet on the ground.